I have been assisting a friend with some electrical issues in his 1964 DeVille Convertible.  Owing to the fact that all of the wiring in the driver's door conduit had been severed, and patched together many times over the years, I replaced the entire LH power window harness (windows and by-pass all work now, Yay!)  and the 6-way power seat harness.  The upholsterer had the front seat out, and installed the carpet and padding down over the seat wiring. Before changing the wire harness, the motor ran in some positions, not in others.  There was no seat movement because the transmission was not engaging.  So my questions:

1.  I suspect that motor operation in all positions of the switch, but no movement, means a disconnected or defective transmission. Am I correct in thinking this, before I take the seat out? The upholsterers had the seat out to replace the carpeting on the floor, and also on the lower portion of the seat.

2.  This car also had a problem with the driver's side courtesy light door jamb switch. At times, especially when the car was in motion, all the courtesy lights would come on. Inspection of the wiring revealed a multiplicity of cuts, splices, and repairs, and some exposed, bare wire. The sparse coverage of this in the FSM indicates two black wires to the door jamb switch, is this correct?  In the meantime, the body feed fuse has been removed to prevent battery drain, and potential fire hazard with bare wiring.

3.  The passenger-side outer headlamp was dim.  I replaced it, and it is still dim.  The FSM wiring diagram indicates a black wire ground.  Where does the ground wire attach?  To the radiator cradle, body sheet metal?

Any thoughts or insight is much appreciated.  Thanks!

Charles Fares

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Wrap any exposed wire with electrical tape to prevent a  possible short 

I think you have an electrical intermittent ground problem regarding the headlight 

The batteries ground wire is below the battery tray so remove the battery 

Grind the negative battery terminal— to the cars frame -to shinny metal you will see a secondary ground off that wire that grounds to the radiator support 

Clean up the metal to metal contact  at both those places and clean the battery terminals both wire connection and posts 

Those are the cars main  power ground connections 

The door jam switches in these cars are a very flimsy design that SB what is causing your courtesy  lights to come on when driving 

I did change my switches to a more modern type that Napa has available but required a slight wiring adjustment to get them to work 

Very glad I made that upgrade as those door jam switches are a part of the —-on always electrical circuit —that runs the clock the glove box light the dash lights and a few other items 

The door jam switches were a constant source of electrical problems until I replaced them being a part of the on always circuit

I reassembled the stock door jam switches a good number of times and reinstalled them  before I gave up on them and changed them to a newer— one  solid piece design switch that has two two pig tales 

All positive wires from  the old switch (3) go to the positive side of the new switch and the ground gets bolted to the old switches ground connection 

Solved my own issue with the constant problem I was having with that door jam switch and no issues since 




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