Alternator is overcharging
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Alternator is overcharging
My alternator on my 1998 dodge neon works at 13.57 volts at idle but when I hit 3000+ rpm it spikes to 32 volts my radio shuts off my amplifier shuts off and it threw 5 obd II codes p0149 p0403 p0123 p0113 and p1492 I did the big 3 I have a high output alternator I resistant checked all my grounds is the pcm malfunctioning or did the overcharge fry all those sensors
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Voltage regulator is built into the alternator on most cars. Is the alternator stock? Pull it out and take it to autoparts store and have it checked for free. Autozone and Advanced are typically across the street from each other. Take it to both and tell them the problem and see if they can get similar results.
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The solution points to itself. If not the alternator it may be the PCM or the wire harness. Much less work to have an alternator checked. I'd start there.
Goodness knows what you have added to the wire harness with the amps and such. When I bought my Neon the kid who owned it before me installed an amp... it melted the wire harness. He pulled the insulation off parts of the harness which let it rub and cook on parts on the engine too.
http://forums.neons.org/viewtopic.php?f=1&p=3007353
Goodness knows what you have added to the wire harness with the amps and such. When I bought my Neon the kid who owned it before me installed an amp... it melted the wire harness. He pulled the insulation off parts of the harness which let it rub and cook on parts on the engine too.
http://forums.neons.org/viewtopic.php?f=1&p=3007353
Last edited by ClaytonH; Aug 20, 2015 at 08:08 PM.
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FFS man... use your head. Have the alternator tested. It's that or the PCM or the wiring/grounding. It's not a stock alternator, maybe your PCM can't manage it.
My definition of stock is not OEM but what the part store tells me is compatible. It may not be an OEM alternator but it is designed to work with the charging system of the car.
In the linkl provided NickKo said it "I think that only a very small group of people have managed to sucessfully convert over to an external regulator.
I think those are all Megasquirt users, who's engines are not dependent upon the PCM, for management.
That would require a lot of work, so it goes beyond the scope of this discussion."
I love autoparts stores. Can get lifetime warranties on so many parts. Sad thing is I have had to return parts within a couple of months because they fail. Re-manufactured or whatever reason. For gods sake man. Have the part tested if there is an issue. Its free... and they'll happily swap the part.
That is unless you didn't know what you were doing and just ordered the largest alternator you could find that would fit the car...
You like the moron who owned my car could only think about how to rice out the car. Why bother consider what was compatible with the existing hardware. Ignorance is bliss until crap starts going wrong.
You're answering your own questions. PCM controls the charge/voltage rates. Alternator is putting out too much voltage. DUH!!! The answer points to itself.... Alternator, wiring or PCM.
My definition of stock is not OEM but what the part store tells me is compatible. It may not be an OEM alternator but it is designed to work with the charging system of the car.
In the linkl provided NickKo said it "I think that only a very small group of people have managed to sucessfully convert over to an external regulator.
I think those are all Megasquirt users, who's engines are not dependent upon the PCM, for management.
That would require a lot of work, so it goes beyond the scope of this discussion."
I love autoparts stores. Can get lifetime warranties on so many parts. Sad thing is I have had to return parts within a couple of months because they fail. Re-manufactured or whatever reason. For gods sake man. Have the part tested if there is an issue. Its free... and they'll happily swap the part.
That is unless you didn't know what you were doing and just ordered the largest alternator you could find that would fit the car...
You like the moron who owned my car could only think about how to rice out the car. Why bother consider what was compatible with the existing hardware. Ignorance is bliss until crap starts going wrong.
You're answering your own questions. PCM controls the charge/voltage rates. Alternator is putting out too much voltage. DUH!!! The answer points to itself.... Alternator, wiring or PCM.
