Battery light on due to bad ecu?

zredfire04

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04 cobra, pullied w/OR x pipe.

A while back my low hanging exhaust snagged on a driveway. Then the car died. Found a bad fuse which I replaced. Car started and ran.

Two things were wrong...battery light was on and reverse lockout solenoid wouldn't release.

Recently put the car in the shop and found wires to a rear o2 sensor had pulled apart as the likely cause of the fuse blowing as they could short to the exhaust.

New battery, and alternator works as it should. Is it possible a fried ecm could be the culprit?
 

SecondhandSnake

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I doubt it's the ECU. I don't believe it's connected to the alternator.

Is the alternator working? If it is, it's just the lamp circuit. It goes from hot at the fuse box, to the lamp, to the alternator. It might be shorted out somewhere between the lamp and alternator. Although to my recollection that wire goes in the harness under the driver's side fender.

If it's not working, check to make sure the other wire going to it (yellow) is giving battery power to the alternator to excite it, otherwise it won't charge. That should be fuse F1.20 in the battery fuse box.
 

zredfire04

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The alternator appears to be working normally..

I'll check fuses and yellow wire when I get the car back.

I didn't think ecu being bad made sense either. The suggestion was that since the o2 sensors go to the ecu, the wires shorting could have fried the ecu and caused this problem.
 

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