Carmine
Old Man with a Hat
I have a feeling I've seen this problem before and thought I'd ask before re-inventing the wheel and combing through wiring diagrams. This is a Late B-body, but the wiring and components would be the same on any C-body.
You may recall that my Magnum took a little poke in the front end last fall...
I've since replaced the header panel (heads up, all the metal, center support structure interchanges with a '78-'79 Cordoba, despite not having hidden lights). My headlamps/motor/doors all worked very well before the impact, and they were off when it hit. I was careful not to turn them on until I was in repair-mode.
The motor appears to have come through the crash "ok", it looks fine and turns easily back and forth. Upon reassembly and initial try-out....
... the motor only receives power in the "down" direction (confirmed with a voltmeter). As in, I turn the key on, headlights off, and they immediately open. The correct re-install procedure is to install the motor and doors in a half-way position. This way, there will be no binding, and the doors will fully close (or require some adjustment). Instead, mine fully open.
Any quick ideas here? As I said, the motor leads are only powered through one side (should be both, depending on switch position) so this has to be an electrical, not mechanical issue. If it were a cut wire in the harness, it still wouldn't explain why it does the opposite of what it should... Opens with key on, lights off. I'll go at it again this afternoon and report back if no one has seen this issue.
??
You may recall that my Magnum took a little poke in the front end last fall...
I've since replaced the header panel (heads up, all the metal, center support structure interchanges with a '78-'79 Cordoba, despite not having hidden lights). My headlamps/motor/doors all worked very well before the impact, and they were off when it hit. I was careful not to turn them on until I was in repair-mode.
The motor appears to have come through the crash "ok", it looks fine and turns easily back and forth. Upon reassembly and initial try-out....
... the motor only receives power in the "down" direction (confirmed with a voltmeter). As in, I turn the key on, headlights off, and they immediately open. The correct re-install procedure is to install the motor and doors in a half-way position. This way, there will be no binding, and the doors will fully close (or require some adjustment). Instead, mine fully open.
Any quick ideas here? As I said, the motor leads are only powered through one side (should be both, depending on switch position) so this has to be an electrical, not mechanical issue. If it were a cut wire in the harness, it still wouldn't explain why it does the opposite of what it should... Opens with key on, lights off. I'll go at it again this afternoon and report back if no one has seen this issue.
??
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