1954 Desoto Firedome Hemi wiring schematic needed - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-02-2013, 10:15 AM
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1954 Desoto Firedome Hemi wiring schematic needed

I'm in need of a wiring schematic for a 1954 Desoto Firedome Hemi that just arrived at the shop and has some serious wiring issues.

Does anybody have a schematic, links to one, or a resource for one? I don't usually do restoration work (or work on cars this "new"), so I'm at loss for now.

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Old 07-02-2013, 10:51 AM
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2 second google search.
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Old 07-02-2013, 12:03 PM
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Quote:
Originally Posted by killeratrod View Post
2 second google search.
Thanks. I've had such poor luck using Google to find obscure car stuff like this I had given up long ago.

But a close check reveals that diagram is for a 1949 Desoto Six, so still looking.

I did find
this link this link
to a factory service manual.

Last edited by hduff; 07-02-2013 at 12:30 PM.
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Old 07-02-2013, 12:35 PM
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ok try this one out.

1954 1955 DeSoto Shop Service Repair Manual Book Engine Drivetrain Electrical OE | eBay
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Old 07-02-2013, 12:47 PM
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Originally Posted by killeratrod View Post
ok try this one out.

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Same book; just ordered it from Amazon for a few bucks less.

What I'm dealing with is an original wiring harness that has been modified and repaired over the past 60 years and it is now difficult to tell OEM from "modified".

And of course, it's all a crapfest of jumpered and spliced wires. he starter barely turns (with a charged 6Vbattery), half the lights don't work and there's a short somewhere. If this was not for a friend, I would be running the other way.

Thanks for your response.

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Old 07-02-2013, 01:47 PM
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Quote:
Originally Posted by hduff View Post
I'm in need of a wiring schematic for a 1954 Desoto Firedome Hemi that just arrived at the shop and has some serious wiring issues.

Does anybody have a schematic, links to one, or a resource for one? I don't usually do restoration work (or work on cars this "new"), so I'm at loss for now.
It's not too often that I work on something that new either. The newest DeSoto wiring diagram I have is for a '53. but hopefully it will help.

Good Luck....
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Old 07-02-2013, 02:00 PM
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Originally Posted by Joe G View Post
It's not too often that I work on something that new either. The newest DeSoto wiring diagram I have is for a '53. but hopefully it will help.

Good Luck....
Thanks. 53/54 were very similar. I can already see how somebody farked up the starter relay: both heavy cables are attached to the same stud. I suspect that was their "fix" for a bad soleniod.

This won't be pretty.
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Old 07-02-2013, 04:02 PM
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Begin by grounding the body to the frame and the frame to the motor. I know you know this, just reminding you not to begin running wire until you have the whole mess properly grounded.
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Old 07-02-2013, 04:57 PM
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Begin by grounding the body to the frame and the frame to the motor. I know you know this, just reminding you not to begin running wire until you have the whole mess properly grounded.
I just replaced the very deteriorated battery cables and cleaned their connections to the motor and starter relay; battery is now fully charged (but disconnected). Next I'll get it up on the lift, clean and check the connections at the starter and the grounds to the body frame, hook the battery back up and take some measurements to check on voltage drop, then check starter and generator performance.

The car was last actively driven in 2000, so that was probably the last time it was serviced, so once I get it to turn over, I'll change all the fluids.

It is a thrill to be working on an original Hemi car.
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Old 07-02-2013, 05:09 PM
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ok i like to help out but this car was last actively driven in 2000 . Then your other post about paint says it was painted 4 years ago. does not add up too me. am i missing something?
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Old 07-02-2013, 06:02 PM
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The car was repainted for her dad just before he passed away. He took it for a few spins around the block and then parked it. The car has not been routinely (that might be a better word) driven since 2000 when her dad got too old to drive regularly.

Other than the Hemi, the car's not worth much, certainly not worth doing a full restoration. I'm just try to get the car back to running condition so it does not become junkyard fodder. That may ultimately be pointless, but the car has great sentimental value to my friend and her siblings.
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