So I changed the water pump and thermostat on my 8 after 2 months of sitting and fired it up for the first time, started no problem first bump of the key, but I had the battery light come on.
I have an Optima yellow top freshly charged on the trickle charger all winter. Tested good 12V at about 600CCA. The battery was good so I figured it could be the alternator.
I changed tension on the belt hoping that could be the problem, no dice. Still battery light, checked the connections and still battery light. So I picked up a low mileage alternator from someone with a wrecked 8 locally that was parting out.
Swapped in the alternator and still have the battery light followed by check engine light and I scanned it and came back with P0131.
Now Im wondering what else it could be, hoping its not the alternator I just bought. I tested voltage at idle at the battery posts and it reads about 11.4V. So I'm not 100% sure if thats the correct way to test alternator output since Im a noob at electrical systems.
But that looks like its not giving a charge to the battery because I do know the alternator is supposed to give anywhere from 13-14V to the battery.
Also the check engine light indicates low voltage at the front o2 sensor so I'm not sure if thats whats causing the battery light or is the alternator I just bought bad. Anyone have this problem?
EDIT: Not sure if this is relevant but when doing the thermostat I did unplug the wires/harnesses to the PCM and moved them out of the way so I could reach the thermostat easier. Not sure if its a PCM related problem causing my battery light too.
I have an Optima yellow top freshly charged on the trickle charger all winter. Tested good 12V at about 600CCA. The battery was good so I figured it could be the alternator.
I changed tension on the belt hoping that could be the problem, no dice. Still battery light, checked the connections and still battery light. So I picked up a low mileage alternator from someone with a wrecked 8 locally that was parting out.
Swapped in the alternator and still have the battery light followed by check engine light and I scanned it and came back with P0131.
Now Im wondering what else it could be, hoping its not the alternator I just bought. I tested voltage at idle at the battery posts and it reads about 11.4V. So I'm not 100% sure if thats the correct way to test alternator output since Im a noob at electrical systems.
But that looks like its not giving a charge to the battery because I do know the alternator is supposed to give anywhere from 13-14V to the battery.
Also the check engine light indicates low voltage at the front o2 sensor so I'm not sure if thats whats causing the battery light or is the alternator I just bought bad. Anyone have this problem?
EDIT: Not sure if this is relevant but when doing the thermostat I did unplug the wires/harnesses to the PCM and moved them out of the way so I could reach the thermostat easier. Not sure if its a PCM related problem causing my battery light too.
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