wiring question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

prg machine · 03-17-2008, 06:16 AM

I am putting together a wire loom for my truck. It is the one that runs along the firewall and down to the starter. I have found a splice that looks to be factory, but I am not sure, The funny looking white wire shown splices to 2 yellow wires. One goes down to the starter and the other to the distributor or coil I am not sure which.. Is this stock? what is the white wire and why is it a different insulation than the rest of the wires???

IBAPIGFARMER · 03-17-2008, 06:23 AM

white wire is your resistor wire for the points.

jeffspower · 03-17-2008, 06:24 AM

It is the OE resistance wire for the points distributor. Points can't be ran with full battery voltage. The wire to the starter goes on the "R" terminal. It supplies the points with full voltage while cranking for easier starting. If you are switching to HEI, replace it with regular wire & leave out the "R" circuit.

BurnoutNova · 03-17-2008, 06:33 AM

Quote:

Originally Posted by jeffspower

It is the OE resistance wire for the points distributor. Points can't be ran with full battery voltage. The wire to the starter goes on the "R" terminal. It supplies the points with full voltage while cranking for easier starting. If you are switching to HEI, replace it with regular wire & leave out the "R" circuit.

excellent description

prg machine · 03-17-2008, 08:20 AM

So if I am running MSD forget the whole schmear? Just run a hot ignition wire full 12 volt and tape off these wires if i follow you correctly. S????

If i understand correctly the resistance wire supplys the volts while running in a resistance state and while starting .the R returns full olts to the points for starting.

Since i am running MSD I will find a switched hot source and forget these wires.

**El Jay** · 03-17-2008, 08:54 AM

Quote:

Originally Posted by prg machine

So if I am running MSD forget the whole schmear? Just run a hot ignition wire full 12 volt and tape off these wires if i follow you correctly. S????

If i understand correctly the resistance wire supplys the volts while running in a resistance state and while starting .the R returns full olts to the points for starting.

Since i am running MSD I will find a switched hot source and forget these wires.

If you are running a "Full" MSD system you only need about 3, or so, volts to run the system, because the MSD box gets its power directly from the battery.
That's assuming that you wire it up according to their instructions.

In other words, you don't need to worry whether you activate it through a resistance wire, or straight 12 volts, or not.

prg machine · 03-17-2008, 11:03 AM

"Full" MSD is what I got. Distributor, box, coil.

03-17-2008, 06:16 AM	#1
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	wiring question I am putting together a wire loom for my truck. It is the one that runs along the firewall and down to the starter. I have found a splice that looks to be factory, but I am not sure, The funny looking white wire shown splices to 2 yellow wires. One goes down to the starter and the other to the distributor or coil I am not sure which.. Is this stock? what is the white wire and why is it a different insulation than the rest of the wires??? Attached Images __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

03-17-2008, 06:23 AM	#2
IBAPIGFARMER Registered User Join Date: Jan 2008 Location: Holt,Mo Posts: 30	Re: wiring question white wire is your resistor wire for the points. __________________

03-17-2008, 06:24 AM	#3
jeffspower Well, Whoop-dee-do! Join Date: Mar 2003 Location: Easton, Mo. pop.- me & scarcely a few others Posts: 2,302	Re: wiring question It is the OE resistance wire for the points distributor. Points can't be ran with full battery voltage. The wire to the starter goes on the "R" terminal. It supplies the points with full voltage while cranking for easier starting. If you are switching to HEI, replace it with regular wire & leave out the "R" circuit. __________________ '68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car

03-17-2008, 08:20 AM	#5
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: wiring question So if I am running MSD forget the whole schmear? Just run a hot ignition wire full 12 volt and tape off these wires if i follow you correctly. S???? If i understand correctly the resistance wire supplys the volts while running in a resistance state and while starting .the R returns full olts to the points for starting. Since i am running MSD I will find a switched hot source and forget these wires. __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:

03-17-2008, 11:03 AM	#7
prg machine Registered User Join Date: Jun 2007 Location: oregon Posts: 1,069	Re: wiring question "Full" MSD is what I got. Distributor, box, coil. __________________ 69 K-20 cloned to a 67 with front clip and some other stuff. 383 .040 over Crane roller cam lifters and rockers ,1.6 intake ratio, Open chamber heads, 9.5-1 compression ratio, 2.02 intake valves , Edelbrock performer Air Gap manifold Carter AFB performer 750cfm, MSD ignition, SM465 NP205 4.10 gears:



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