1970 442 Identifying relays wiring under hood...

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Old Nov 29, 2024 | 12:40 PM
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1970 442 Identifying relays wiring under hood...

Does anyone know what the relay or terminal post is in picture 1 and also in picture 2.

In picture 3 that is along the drivers side fender.. Was this part of factory wiring Doesnt look like it but i need to verify.. If not, i will elimate it.
I ask this because I am only getting 5.6 v on the positive coil terminal and when cranking its at 8.9v.

Would it be correct that this incorrect voltage could be from a mismatched ballast and/or these relays?

Thanks
1
1
2
2
3
3

Old Nov 29, 2024 | 01:45 PM
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Photo 1 is the circuit breaker for your power seat (along with anything else the car may have like power windows, top, etc)
Photo 2 is the high speed fan relay for the blower motor (only found on A/C cars) The white ballast resistor next to it is not correct. The car originally had a high resistance wire running in the engine harness that provided the correct voltage to the coil.
Photo 3 is the horn relay. It is in the correct location, but it is a latter replacement version.

Last edited by Loaded68W34; Nov 29, 2024 at 01:48 PM.
Old Nov 29, 2024 | 03:31 PM
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I will trace out the wire leading to the resistor but it doesnt look like the resistance wire.. ill see what the volatge is before it and see if i can jump it.

The car has an internally regulated alternator.. would you know where the external regulator plug would have been located?

Also for the wiring i believe the white and blue of those wires would be in the connector going into the alternator and then a brown and red would be left.. brown is light on dash and red is power... would it be red wire to white and brown to blue on the alternator clip?

Thanks!
Old Nov 29, 2024 | 04:18 PM
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Post a pic of your alternator and wiring. A 70 442 had an internally regulated alternator from the factory. Olds started using internally regulated alternators on 442's in 69, but regular cutlasses and supremes still got externally regulated alternators with a voltage regulator mounted on the firewall in the area above the distributor. I believe from previous posts your car is a 442 correct? If it is, the factoy alternator would have an open faced/ diamond back case. If your car still has this, you are in luck because most have been replaced over the years. Correct original units are quite expensive if you can find one. A recent thread on here showed a very nice original unit that just sold for $2700 or so.
Old Nov 29, 2024 | 04:53 PM
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This is all i have for now as im not near the car..

In all the schems i have, it shows externally regulated alternator..

I dont see the regulator on the firewall...

I cant wait ti check what wire is feeding that balast resistor that shouldnt be there.. it has to be a 12 or 14 gauge.. def not that 20 gauge in schem..
Old Nov 29, 2024 | 05:08 PM
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Originally Posted by 70_455
In all the schems i have, it shows externally regulated alternator. I dont see the regulator on the firewall...
Only a few GM cars had the internally-regulated alternator in 1970. Two that did were Corvette and 442. That's why you don't see a regulator.
Old Nov 29, 2024 | 05:14 PM
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Great to know! ... Main last thing is to get the correct voltage to the coil...and dumping that ballast resistor..
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