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Old 06-03-2005, 12:41 PM
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GM truck charging system ?

Can anyone tell me how the wires for the charging system on a early 90's GM truck run(91 to be exact) ? This engine and all the wiring was installed into a 48 Dodge buisiness mans coupe and the battery must be located in the truck so I would like to know what wires I need to run where ?
The one thing I really want to know is if I have to run a second smaller wire from the battery like the original has ?

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Old 06-03-2005, 02:56 PM
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alternator wires

There are three wires. One for charging, one for field winding, and one for idiot/voltmeter. The field winding and charging wires feed to the main postive wire on the starter. Both should have fusible links. The charging wire is the largest red wire that connects to the bolt on the alternator. The field wire is the smaller red wire that is connected by the plastic connector. The idiot light wire (usually brown) is the second wire in the plastic connector. It is fed to the idiot light and the light's other wire goes to the fuse box on a switched circuit.

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Old 06-03-2005, 03:55 PM
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one wire or 3 wire?

Doc here,

If it's a 1 wire, The main 10 gauge wire will go to a fuse link on the starter solenoid, Or if equipped, the single lug terminal with the fuse links on it. then run a Black 10 gauge ground wire from the Alternator mount bolt (or Case lug) To The main ground wire by your starter.

If it's a 3 wire, the same as above in addition to: The field wire to be run to the Ignition Buss side of the fuse box, (switched power) and the Indicator wire to the Dash light or Voltmeter, or both Which ever you have.

If you are Carbed, with an Electric Choke, You'll want to parallel that Field wire into a Relay Coil Circuit, and ground, Then on the Contact side of the relay, Run the normally OPEN contact to the Fuse link, and the center wiper to the Electric Choke Coil terminal.

This will give you an Electric Choke that will operate ONLY while the engine is as not to have it open prematurely, should you sit with the ignition "ON" for instance listening to the radio...for 3 minutes or longer, on a dead cold engine, thus defeating the purpose of the Choke, and is factory Stock...

You can ALSO parallel a "Batt" light or LOW Voltage light or CHOKE HTR light from the center wiper...since this relay will Chatter if the diodes ever start to go bad in the altenator...and is a good "first line" troubleshoot device..If the Alternator ever starts to go out.

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