Battery dying
Asked by Tim Dec 11, 2018 at 02:51 PM about the 2008 Dodge Grand Caravan SXT FWD
Question type: Shopping & Pricing
Hey Master Mechanics. Is it possible that the internal battery of the PCM, if
bad, would cause the battery to drain within a day or two. I have tested every
fuse by using a circuit tester, disconnecting the neg bat cbl and removing each
fuse. There was no break in the circuit. We also observed a draw on the battery
after removing the pos cable from the Alternator. Does that make sense?
6 Answers
Hornet_2497 answered 6 years ago
Your slow drain may be internal to the vehicle's main battery. With battery fully charged, disconnect it over night and check voltage in the morning. Also see if it's strong enough to crank the engine. If it tests poorly, it is slowly dying from an internal short.
Do a parasitic drain test. Hornet...congratulations on 10K
Hornet_2497 answered 6 years ago
Thank You Guru9FSV8. It took a while but I learned as much as I shared, and it's been a lot of fun. Lots of nice, intelligent people on this forum. Most of repair is diagnostics or simple logic. And if everyone was retired, they would have 10,000 points too.
Hornet_2497 answered 6 years ago
Don't let Ed kid you. He's pretty knowledgeable and communicates it very well. Where do you think I've learned all those correct answers? Seriously....Ed is very sharp with diagnostics and that comes from a ton of hands on experience.
Batteries have been fine. Latest one 2 weeks old and test fine.
Narrow down the circuit that is draining your battery by doing a parasitic drain test
