Dead battery with no warning

[MikeMcMo]

Originally Posted by Geof3

Yep, pretty much every battery I've owned has died a full death right away. My Jeep's battery died not too long ago. Fine one minute, completely shot the next. When the batt died in my Box, it wasn't quite so sudden, but close. Then the new battery I put in lasted about a day. Dead. Wound up I had a bad voltage regulator on my alt, but the second battery was DOA... swapped the VR, new batt... good to go.

Right, so if I go get a battery, it may be a day or so before I confirm that the alternator and VR are still good, right? I have read some here and on RennTech where the alternator and battery tests can be erroneous even when tested under load. I like life's little mysteries.. but only to a point.

[fatmike]

I sold my 986 years ago. I changed the ignition switch multiple times.

When they fail, they do very strange electrical things (like leaving lights on even after you lock the car) which could drain your battery randomly...

Also check to see a light isn't on after you lock the car. Look at the car in the dark.
Sometimes the little sensor sticks and the light stays on. Check that the frunk light is out. I used to put my 5 year old in it...LOL (just kidding)...

Good luck.

/

[Geof3]

Originally Posted by MikeMcMo

Right, so if I go get a battery, it may be a day or so before I confirm that the alternator and VR are still good, right? I have read some here and on RennTech where the alternator and battery tests can be erroneous even when tested under load. I like life's little mysteries.. but only to a point.

Ha, no. Mine was a weird series of events. My batt light came on at the track one afternoon, obviously suggesting a charging issue. No obvious issue, light then went off, drove the car home, dead the next day. Bought a new battery put it in, started, showed good voltage no worries. Dead battery next day. The battery failed for some reason, it just died. So, yet another battery, car started, voltage very low... so alt test time. Discovered it was the voltage regulator and swapped it with a Bosch unit. Good to go.