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Ecklers AutoMotive
Username Post: solenoid wires        (Topic#275866)
Forum Newbie
Posts: 4

Age: 62
Loc: Copper Mtn. CO
Reg: 02-02-12
02-03-12 12:32 PM - Post#2186751    

Hi Folks, I am in the process of repairing wiring on a 63 c10 with a 283 that had a carb fire and fried a few items. This forum has been a big help in this effort. I have a couple of questions on where wires run from the solenoid terminals. Seems to be confusing in the wiring diagrams. Seems that the wiring through the Engine Harness is different for the V8 vs. L6?

1. When bypassing the R terminal I am running thru the engine harness from 18-P (power)to a ballast resister on the firewall, then to the coil+ . Is the 20-W/OR wire anything special or can I run a regular 14 gauge from the Engine harness since it connects to the external ballast resister?
2. The S terminal shows wire 16-v thru the engine harness to 16-v to the ignition switch which I assume energizes the starter.
3. This is what I don't understand. Where does the 18-B wire go (extra wire from B terminal). Do I even need it. Where was it supposed to go to? Power extra accessories?
Jim Arnold
Leadville, Colorado

Ecklers AutoMotive
Deceased Member RIP Art
Posts: 12969
Age: 70
Loc: Long Beach Ca, near Vet's...
Reg: 03-28-02
02-03-12 12:42 PM - Post#2186755    
    In response to jimcarnold

The small terminal on the starter solenoid (furthest one from the engine) is wired directly to the positive side of the coil.

When the starter is engaged, that wire delivers a full 12 volts to the ignition coil for a hotter spark when starting. When the starter disengages, the coil is fed lesser voltage through the ballast resistor to keep from burning up the ignition points in the distributor.

Home.., is where dog hair sticks to everything but the dog.

"15th Year" Gold Supporting Member
Posts: 18770
Loc: Colorado Springs, CO
Reg: 08-08-04
02-03-12 08:13 PM - Post#2186900    
    In response to Old_Longboarder

It depends on whether you are running a points or an HEI setup.

The ballast resistor is tied into the coil on a POINTS system, so that it supplies 9 volts to the coil when the motor is running. This lower voltage lengthens the life of the points. During starting however, the coil is fed a full 12 volts to make starting easier.

An HEI system has a full 12 volts fed to it when starting or running, because the switching transistors inside the HEI won't burn out like points will. This is why the two systems are wired differently.

The two small terminals on the starter solenoid are marked as R and S - which stand for Relay and Solenoid, which probably doesn't mean anything to you. SO, think of the two terminals this way - S stands for Start, R stands for Run.

The S terminal is for engaging the starter. The R terminal is for supplying high current battery voltage - to the coil and to the fuse panel. The R terminal is ONLY USED IN POINTS SYSTEMS - the HEI system has no need for it.

A diagram that might help you:

Attachment: Main_power_60-66.jpg (58.43 KB) 120 View(s)

Forum Newbie
Posts: 4

Age: 62
Loc: Copper Mtn. CO
Reg: 02-02-12
02-05-12 12:51 AM - Post#2187309    
    In response to Vaughn

Thanks a bunch that makes sense. You guys rock.
So it appears like the PO bypassed the solenoid with the coil wire and ran it directly from the engine harness to the resistor and then the coil. Will check the relay terminal for 12v at starting and wire that back in. I guess he never had much problem starting with 9 volts? My other question was where does the 18-B wire go as shown in the V8 wiring diagram. It does not seem to appear on the other side of the engine harness wiring diagram.
Extra power lead to some accessories?

Thanks again, this pool of knowledge is priceless

Ecklers AutoMotive
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