Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

LinkBack Thread Tools Display Modes
Old 07-19-2012, 03:55 PM   #1
Registered User
Join Date: Jul 2004
Location: Houston, Texas
Posts: 7,240
Electrical power fluctuation

For the first time, I noticed my aftermarket head unit's digital display pulsing (Brighter... Dimmer... Brighter... Dimmer) with each thump of the bass response. By turning off the Litronics, the pulsing illumination issue stopped.

I am not running a subwoofer or an aftermarket amp. Apart from the head unit, everything else is stock.

Do I have anything to be concerned about?

'97 Boxster (Black Hole for 42,000 Dead Presidents and counting) - 122k
New motor, transmission, suspension, and on and on and on it goes...
RandallNeighbour is offline   Reply With Quote
Old 07-19-2012, 07:14 PM   #2
Registered User
Jaak's Avatar
Join Date: Oct 2009
Location: Toronto, Canada
Posts: 173
Check out my battery thread in the technical forum.

It could be the battery may be weak, have a Group 48R VS 94R battery which is better for upgraded sound systems or a possible grounding issue.
2002 Boxster S Seal Grey

2010 Ford F150 FX4 Luxury

Retired after 38 years with the same company.
Jaak is offline   Reply With Quote
Old 07-19-2012, 08:31 PM   #3
Custom User Title Here
particlewave's Avatar
Join Date: Mar 2012
Location: WA
Posts: 6,087
I would suspect a weak battery as well. If this is the case, the headlamps should dim a bit with the bass, too.

Edit: scratch that...I don't know anything about your headlamps, but I'm guessing that they are HID with ballasts. The ballasts would probably even out the power fluctuations and have no noticeable dim. Better indicator would be the dome light, with hl's on and stereo turned up. If the dome light dims, that would lead me to believe that the battery is weak.
However, there are many things that could cause power drain. Could be heat weakening the battery or a failing alternator, also.
I would take it to an auto parts store and have the battery and charging system checked. It's usually free.

Last edited by particlewave; 07-19-2012 at 08:59 PM.
particlewave is offline   Reply With Quote
Old 07-20-2012, 03:42 AM   #4
Registered User
Join Date: Sep 2011
Location: eastern NC Crystal Coast
Posts: 413
Battery getting ready to leave you !!!
milliemax is offline   Reply With Quote
Old 07-20-2012, 05:26 AM   #5
Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 5,396
Load test the battery, but also load test the alternator; this is a classic sign of a dying voltage regulator.

Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
JFP in PA is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -8. The time now is 12:47 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page