12-11-2015, 10:00 AM
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#1
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Registered User
Join Date: Nov 2015
Location: Illinois
Posts: 115
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battery tender
Just hooked up my battery tender and the red light stays on which suggest there is a draw on the battery somewhere.I am wondering if the front trunk has to be pushed all the way down for the light to shut off,is there some kind of button somewhere to make sure the light is off.I am not sure this is what is causing the drain,I will leave the battery tender on overnight and see if that helps and the green light comes on.I do not want to leave the battery tender on with the red light on all the time
also if I remove just the negative cable on the battery to hook up the battery tender will I have any problems with loosing all kinds of set ups.any problems with removing just the negative cable.Thanks Again Jimbo
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12-11-2015, 10:18 AM
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#2
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Registered User
Join Date: Oct 2008
Location: Ohio
Posts: 868
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Save yourself all of the problems you are anticipating by using the cigarette lighter connector. And yes, you will lose data and settings by disconnecting the battery.
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12-11-2015, 11:26 AM
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#3
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Registered User
Join Date: Dec 2013
Location: Dahlonega , Georgia
Posts: 1,350
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Pop out the trunk light and pull off one of the wires they are just slip on connectors. When done charging slip the wire back on and snap the light fixture back in place.
__________________
2002 Boxster S Arctic Silver with black top with glass window and black leather interior. Jake Raby 3.6 SS ( the beast ) with IMS Solution. 996 GT3 front bumper , GT3 rocker covers and GT3TEK rear diffuser and Joe Toth composites rear ducktail spoiler .
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12-11-2015, 12:45 PM
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#4
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Registered User
Join Date: Dec 2008
Location: Queensland, Australia
Posts: 1,522
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No need to disconnect the frunk light (or the rear either). There is a timer that shuts off the lights after ~ 2 hours. Just make sure you remove the ignition key.
__________________
2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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12-11-2015, 12:59 PM
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#5
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Registered User
Join Date: Nov 2013
Location: Emerald City
Posts: 885
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It'll stay red for about 24 hours. After that it will turn green assuming you have the battery tender Jr or pro. This is normal.
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12-11-2015, 01:39 PM
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#6
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Registered User
Join Date: Nov 2015
Location: Illinois
Posts: 115
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Battery tender
Thanks everyone,the green light just started blinking
Will the trunk light eventually come back on after I close the hood permentaley,thanks again Jimbo love all the information on this forum.just learning and enjoying my new to me boxster
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12-11-2015, 03:12 PM
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#7
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Registered User
Join Date: Apr 2014
Location: Chicago
Posts: 329
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solid red=charging, solid green=maintaining fully charged. If it's flashing either color, recheck connections and try again or battery tender/battery might be bad. Also make sure to keep the car shut but unlocked.
__________________
'99 Porsche Boxster 986 - weekend car
'04 BMW 645ci e63 - daily driver
'98 BMW 528i e39 - dog carrier
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12-11-2015, 04:59 PM
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#8
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Registered User
Join Date: Apr 2007
Location: Bay Area
Posts: 524
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I use the battery connector that bolts on the terminals and rout through under the hood and up right below the wiper blade. No need to open the hood when I connect the batt tender. This also helps when your battery dies and can't open the hood.
__________________
2008 Boxster S PDE2
02 Boxster S Blk on Blk(Stock for the Wife)
88 turbo S (My Toy) slightly modified
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12-11-2015, 07:19 PM
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#9
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Registered User
Join Date: Jun 2012
Location: Milwaukee, WI
Posts: 383
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Quote:
Originally Posted by schnellman
Save yourself all of the problems you are anticipating by using the cigarette lighter connector. And yes, you will lose data and settings by disconnecting the battery.
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+1 That's how I have mine set up. Worked great the first Winter. The second Winter (last year), I noticed it was flickering green. Not bothering to read the manual again, I assumed that meant the battery was at full charge and just trickling as needed. Uh, no. When plugging into the cigarette lighter, you have to make sure the contacts are extended just a bit because the diameter is slighter larger than on U.S. and Japanese autos.
Within two weeks after bringing it out of storage this year, the battery died.
I remembered this Autumn when wrapping it up again, and the light is showing a steady green.
DBear
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12-12-2015, 03:14 AM
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#10
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Registered User
Join Date: Dec 2013
Location: Dahlonega , Georgia
Posts: 1,350
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Quote:
Originally Posted by Steve Tinker
No need to disconnect the frunk light (or the rear either). There is a timer that shuts off the lights after ~ 2 hours. Just make sure you remove the ignition key.
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I have never kept the trunk open that long to see if the light goes off but I do know on my car after about 5-10 minutes the light fixture is quite warm. I'm not sure I'd like to leave it on for an hour or two before automatically turning off.
__________________
2002 Boxster S Arctic Silver with black top with glass window and black leather interior. Jake Raby 3.6 SS ( the beast ) with IMS Solution. 996 GT3 front bumper , GT3 rocker covers and GT3TEK rear diffuser and Joe Toth composites rear ducktail spoiler .
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12-12-2015, 03:57 AM
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#11
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Registered User
Join Date: Nov 2015
Location: Illinois
Posts: 115
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battery tender
well it finally is on green no flashing,I do not understand why running the bt wires under the hood by the wipers makes a difference.If the bt stopped working and your battery went dead how would you open the trunk to jump the battery.Wouldnt it be better to just leave the trunk open a little
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12-12-2015, 05:16 AM
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#12
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Registered User
Join Date: Nov 2013
Location: Emerald City
Posts: 885
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Quote:
Originally Posted by Jimbo409
well it finally is on green no flashing,I do not understand why running the bt wires under the hood by the wipers makes a difference.If the bt stopped working and your battery went dead how would you open the trunk to jump the battery.Wouldnt it be better to just leave the trunk open a little
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No if that happens you use a jumper pack on the power spot to open the trunk. Not a huge issue and if your battery tender is green, you won't have that issue anyway.
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12-12-2015, 05:29 AM
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#13
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"50 Years of 550 Spyder"
Join Date: Jun 2015
Location: The Road
Posts: 948
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One tip....
....batteries like to "take a charge" after they are drained just a little bit.
Battery tenders work best, when the battery has been drained just a little bit down from full charge.
When you park your car, turn the headlights on after you shut the engine off and let the lights burn for about five minutes before shutting everything down and plugging in the battery tender.
The battery will then "accept the charge" and the circuitry inside the tender will recognize the state of charge and enter the proper charge/maintain cycle.
FWIW, the "Porsche" branded cigarette lighter chargers work great and can be found pretty cheap online.
Good luck.
__________________
550 SE #310---"It's more fun to drive a slow car fast, than a fast car slow."
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12-12-2015, 10:15 AM
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#14
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Registered User
Join Date: Nov 2009
Location: Winnipeg MB
Posts: 2,485
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I leave my hood on first click for the winter. Just in case the battery does fail I then don't have to do a bunch of dicking about to open the hood. It stays on the battery tender all winter and, to date, I have not had a problem.
__________________
'99 black 986
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12-15-2015, 03:13 AM
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#15
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Registered User
Join Date: Apr 2008
Location: Southern New jersey
Posts: 1,054
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Quote:
Originally Posted by 10/10ths
....batteries like to "take a charge" after they are drained just a little bit.
Battery tenders work best, when the battery has been drained just a little bit down from full charge.
When you park your car, turn the headlights on after you shut the engine off and let the lights burn for about five minutes before shutting everything down and plugging in the battery tender.
The battery will then "accept the charge" and the circuitry inside the tender will recognize the state of charge and enter the proper charge/maintain cycle.
FWIW, the "Porsche" branded cigarette lighter chargers work great and can be found pretty cheap online.
Good luck.
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Why in the world would you need to go through that procedure? I don't put mine on charge unless it's going to sit for 2 weeks or more. Just plug it it, close the door ..... done !
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12-15-2015, 04:39 AM
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#16
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"50 Years of 550 Spyder"
Join Date: Jun 2015
Location: The Road
Posts: 948
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Stephen...
....it's hardly a "procedure", just leave the lights on for a few minutes before you shut everything down and plug in the tender for the season.
I'm not saying you do it every night on a daily driver.
It's just a little trick to make sure the battery takes a full charge if you are putting the car away for a few weeks on a tender. You just unload the car and get the garage ready while the lights are on and then turn off the lights and put her to bed.
Didn't mean to lead you to believe it was a big production.
Forgive me for not being more clear.

__________________
550 SE #310---"It's more fun to drive a slow car fast, than a fast car slow."
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12-15-2015, 07:55 AM
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#17
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,602
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Quote:
Originally Posted by 10/10ths
....it's hardly a "procedure", just leave the lights on for a few minutes before you shut everything down and plug in the tender for the season.
I'm not saying you do it every night on a daily driver.
It's just a little trick to make sure the battery takes a full charge if you are putting the car away for a few weeks on a tender. You just unload the car and get the garage ready while the lights are on and then turn off the lights and put her to bed.
Didn't mean to lead you to believe it was a big production.
Forgive me for not being more clear.
 
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If you are using a decent maintainer, none of that is necessary; the maintainer should be able to figure out what is needed.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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12-15-2015, 04:06 PM
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#18
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"50 Years of 550 Spyder"
Join Date: Jun 2015
Location: The Road
Posts: 948
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Again...
................
__________________
550 SE #310---"It's more fun to drive a slow car fast, than a fast car slow."
Last edited by 10/10ths; 12-15-2015 at 04:19 PM.
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12-16-2015, 02:38 AM
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#19
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Registered User
Join Date: Apr 2008
Location: Southern New jersey
Posts: 1,054
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Quote:
Originally Posted by 10/10ths
....it's hardly a "procedure", just leave the lights on for a few minutes before you shut everything down and plug in the tender for the season.
It's just a little trick to make sure the battery takes a full charge if you are putting the car away for a few weeks on a tender. You just unload the car and get the garage ready while the lights are on and then turn off the lights and put her to bed.
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Fair enough, if it works for you, that's all that matters
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