Jon K
03-28-2007, 10:29 AM
I am not sure what is wrong, if anything. My voltage has been low while driving - I can datalog it in my ECU and see about 13.2 - 13.5 volts usually, but low dips aren't uncommon. The OBC shows like 13.3, 13.5, 13.7, 13.86 sometimes. I bought a new battery as the one I had in my car was about 5 years old now and is a Duralast 48-DL (800 cca) and I bought a Duralast 49-DL (1000 cca).
I measured voltage at the battery terminals - 13.4 - 13.6v
I measured voltage at the back of the alternator to a ground, 13.6 - 13.7v
OBC reports the voltage mentioned above.
The alternator is a Bosch 140A I had put in about 4 - 5 years ago. I got it from BMA and it was either a new or reman, so it should be good - it was ~$200 with a core, so prob reman. Anything else I can check? Car seems to be running fine, the battery was getting elderly so I replaced it, and now I just want to see 14.2v pop up on the OBC like it used to a long time ago!
The belt is a little cracked and squeaks on cold mornings so I am going to replace that next out of default. The weird thing is if I drive from say 3,000 rpm and let off the gas (2nd gear) the volts will sometimes drop to 13.3 from say 13.7. Typically, in my mind, if I am letting off, the voltage in theory should increase since I am no longer squirting the injectors etc. But what the hell do I know!
I measured voltage at the battery terminals - 13.4 - 13.6v
I measured voltage at the back of the alternator to a ground, 13.6 - 13.7v
OBC reports the voltage mentioned above.
The alternator is a Bosch 140A I had put in about 4 - 5 years ago. I got it from BMA and it was either a new or reman, so it should be good - it was ~$200 with a core, so prob reman. Anything else I can check? Car seems to be running fine, the battery was getting elderly so I replaced it, and now I just want to see 14.2v pop up on the OBC like it used to a long time ago!
The belt is a little cracked and squeaks on cold mornings so I am going to replace that next out of default. The weird thing is if I drive from say 3,000 rpm and let off the gas (2nd gear) the volts will sometimes drop to 13.3 from say 13.7. Typically, in my mind, if I am letting off, the voltage in theory should increase since I am no longer squirting the injectors etc. But what the hell do I know!