72 Cutlass Electrical Problem/ Questions
#41
When I had to replace a main dash harness I did the following.
Also while you are in there I would suggest replacing the dash head light switch with a new unit.
- Disconnect battery
- Label all connections with tape, then disconnect.
- Pull the entire dash assembly out of the car.
- Setup a workbench where I could lay out the new harness next to the dashboard
- Install the harness into the dash.
- Reinstall dash into car
- Reconnect all connections
Also while you are in there I would suggest replacing the dash head light switch with a new unit.
Last edited by v8al; September 12th, 2023 at 10:11 AM.
#42
....does anybody have a PDF of the 72 Cutlass service manual or a high resolution of the wiring diagram? A diagram/ labeling of the dash harness would be ideal but a full car diagram will work. I know there was a picture posted above but it is hard to read some of the labeling. Any help would be greatly appreciated.
Do your research - you may find one at a lesser price...
https://www.ebay.com/itm/37459859406...EAAOSwgsZk2rGL
#43
The next book you need to have in your library is the 1972 Oldsmobile Product Information Manual (AKA Factory Assembly Manual [FAM]) which demonstrates how your vehicle was put together at the factory - e.g. sheet metal, engine dress, seats, dash, lighting harnesses, switches, etc.
Contact Hairy Olds
1972 A-Body Product Information Manual
Contact Hairy Olds
1972 A-Body Product Information Manual
#44
There are also heater, A/C, rear window wiring diagrams. This is why you should own a copy of the PIM. Not only will it contain excellent diagrams, but since no one knows the accessories on your car, it's tough to fish around for a diagram you may not even need.
#46
Alright guys. We are well under way. Under the hood there is a wire running from the distribution post to the fuse box. Wiring diagram shows a fusible link on this line. Does anybody know what amperage that fuse is supposed to be? I had a 30A in it and it popped.
Last edited by Rogan; September 18th, 2023 at 01:25 PM.
#48
#49
#50
Outside of a short to ground, a fusible link will not burn instantaneously, it's more forgiving for overcurrent situations and are used to protect electrical systems. Fuses are meant to protect individual components. It's your car do what you want.
#51
Ok, that makes sense. I'm gonna pick up a fusible link this afternoon. Thanks guys!
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