75 C3 Starter with HEI
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Joined: Oct 2002
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From: San Bernardino CA
75 C3 Starter with HEI
I've read that on cars equiped with HEI Systems, ONLY 2 terminals on the Starter were used. The Large Center Post, which is where the "HOT LEAD" from the battery goes too, and the "S" terminal which is the terminal that allows the solenoid to ingage the starter motor. I've read that all other wires go to the "Center Post" also!! Now what I really was wondering is this: What is the function of the "R" terminal?? What does it do?? If it is another "Hot Lead", then when does it come on?? Is it activated by the ignition switch??? Could it be used to power accessories only when the key is turned to the "ON" position?? Can anyone help??? Thanks!!! :flag
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Joined: Jul 1999
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From: Orange Park Florida
Re: 75 C3 Starter with HEI (MrAzz74)
OK, first off, for some stupid reason GM decided to ground the heater motor and windshield wiper motors and something else, I forget, to the engine with a black 10-14 ga wire....with a large loop on the end...looks as if it goes to the battery cable post on the starter....RONG!!!!...ME I pulled mine up top where it belonged connecting to an extra place on the intake manifold....avoids confusion....
NOW, that starter has the battery cable and a red/insulated looking wire grouped with another smaller looped wire the large red goes to the battery post....that picks up a fusible link to the main harness....the other starter wire...purple goes to the S stud, next to the engine block...
that other small stud is in face energized when the starter motor is running/engaged....it takes full available battery voltage to the hot side of the coil, bypassing that resistance wire in the harness that drops voltage for a POINTS type system.....NOW, your '75 should have an HEI system...and so that wire from the R stud is not there and is not needed...
GENE
NOW, that starter has the battery cable and a red/insulated looking wire grouped with another smaller looped wire the large red goes to the battery post....that picks up a fusible link to the main harness....the other starter wire...purple goes to the S stud, next to the engine block...
that other small stud is in face energized when the starter motor is running/engaged....it takes full available battery voltage to the hot side of the coil, bypassing that resistance wire in the harness that drops voltage for a POINTS type system.....NOW, your '75 should have an HEI system...and so that wire from the R stud is not there and is not needed...
GENE
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From: San Bernardino CA
Re: 75 C3 Starter with HEI (mrvette)
So since that "R" Terminal is not needed for the HEI system, I could use it to run power to an Electric Fuel Pump............Yes??? Or an Electric Fan????
This is what I was hoping to do!!!! :yesnod: :nonod:
This is what I was hoping to do!!!! :yesnod: :nonod:
Team Owner
Joined: Jul 1999
Posts: 65,492
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From: Orange Park Florida
Re: 75 C3 Starter with HEI (MrAzz74)
Well, i'ts only 'live' at 12 volts when the starter is actually cranking the engine, otherwise, it's not connected to any power source....it's good for say fuel pump source that BYPASSES any say oil pressure or other safety switch you may have for killing it if engine quits.....that function is part of computer operation on DPFI cars though....but if you had an electric pump and a carb, say...yes, it's useful then....
GENE
GENE
