Hello all

I am new to the forum but have ready alot of posts on this topic. My battery indicator light has turned on and will not turn off.

Background on my car:
Newer battery - One year old
New Alternator
Checked all three fuses and all are good.
Confirmed continuity on all wires coming off of the alternator to the ECM
Pulled 4P plug on alternator and light did not turn off.
Read voltage of wire with IG On and engine off
B/Y - Battery Voltage
W/B - 0 volts
W/R - 5 Volts
W/G - .04 Volts

With engine running
B/Y - Battery Voltage
W/B - .7 Volts - I believe this is bad and should measure battery voltate - What do I learn from this?
W/R - 5 Volts
W/G - 0 Volts

Just trying to see where I should go next?

Any help would be greatly appreciated. I have read that this may indicate an issue with my ECM but did not want to go through this without more work.

I have not checked the ELD yet?

I did a check that I read about on the forums where you pull the 4 wire plug on the alternator and then turn the IG On but not have the engine running.
the battery light if working properly should not be lit per the forum. In my case the light stayed lit. This would typically mean a short or ground. I ready the Whilte/Bue wire to ground and did not have any ground ready with my meter. I also tried to wiggle wires to find a short and did not find any issues.

I have not found a way to make the light turn off. Does this mean the ECM is causing the light to be lit since it is the ovly thing between the light and the wire?
Maybe the cluster?
Thanks for any help.
Ken

 

Do a check of the charging system to eliminate this as a problem. Start car, no load. Should see 14.2 - 14.6v after a period of short warm up. Then, it should drop to a float charge of around 13.6v. Start turning on lights, etc. The ELD should detect the load and the ECM should send a signal to the alternater, bringing the voltage back up. If all good, then it's a prob in the light circuit, possibly faulty ECM.