Charging circuit issues
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Junior Member
Joined: Aug 2008
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Charging circuit issues
I've got a 1997 1500 SS/T 5.9 About a month ago the check engine light and gen light came on while the wife had it. Took it to a dealer and was told the alternator was no good. They did not have access to an alternator so I picked one up locally from a NAPA store and drove it over. The new alternator did not change anything. Next was a NAPA rebuilt PCM which I took to the dealer to have flashed. Still no fix. I have checked all the fuses and taken the alternator in 3 times to have it tested and it always shows good. I have tried to ground the field wire per the Chiltons and it does not change the charging at all.
The engine codes are.
P0743(M) Torque Converter Clutch Solenoid/Trans Relay Circuits An open or shorted condition detected in the torque converter part throttle unlock solenoid circuit (3 or 4-speed auto. Trans. Only).
P0748(M) Governer Pressure Soleniod Control/Transmission Relay Circuits An open or shorted condition detected in the governor pressure solenoid or relay circuits (4-speed auto. Trans. Only).
P1765 (M) Trans 12 Volt Supply Relay CTRL Circuit Current state of solenoid output port is different than expected (4-speed auto. Trans. Only).
Could this short be causing the alternator to not charge???
The engine codes are.
P0743(M) Torque Converter Clutch Solenoid/Trans Relay Circuits An open or shorted condition detected in the torque converter part throttle unlock solenoid circuit (3 or 4-speed auto. Trans. Only).
P0748(M) Governer Pressure Soleniod Control/Transmission Relay Circuits An open or shorted condition detected in the governor pressure solenoid or relay circuits (4-speed auto. Trans. Only).
P1765 (M) Trans 12 Volt Supply Relay CTRL Circuit Current state of solenoid output port is different than expected (4-speed auto. Trans. Only).
Could this short be causing the alternator to not charge???
Captain
Joined: Jul 2008
Posts: 678
Likes: 1
From: Houston, TX
Firstly, fire the dealership. From your description of events, they are absolutely clueless.
What is the condition of the battery? Make sure you have a fully charged battery according to specific gravity, not just a voltmeter. Once you have obtained that, then you can begin systematically checking the charging circuit. Do you have the electrical schematics for a 97? I have a Haynes manual for a 98, and they do a pretty good job providing readable diagrams. Just guessing at this point, but it could be a fusible link somewhere in the charging system. That's where I would start.
What is the condition of the battery? Make sure you have a fully charged battery according to specific gravity, not just a voltmeter. Once you have obtained that, then you can begin systematically checking the charging circuit. Do you have the electrical schematics for a 97? I have a Haynes manual for a 98, and they do a pretty good job providing readable diagrams. Just guessing at this point, but it could be a fusible link somewhere in the charging system. That's where I would start.
Thread Starter
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Junior Member
Joined: Aug 2008
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Thanks for the response. I don't have the ability to test specific gravity on the battery. I do have the wiring diagram also and that was the next step.
Just really seems odd that I can't bypass the EVR and go full charge state.
Just really seems odd that I can't bypass the EVR and go full charge state.