Engine Swap Electric Problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hewl35 · 10-01-2005, 01:48 AM

I've got a 70 C-10 with a transplanted 454 from a 76. The 454 starter has only one wire to the solenoid not two like the other starter had. I threw a battery in and the motor didn't crank but I have good lights, etc so I'm sure the grounds are good. What do I need to do to the wiring harness to get the motor to crank? I'm sure it something simple.

Thanks
Jeff

krue · 10-01-2005, 01:56 AM

The original wiring had one wire from the ignition switch (purple I think) and one going to the coil. The points ignition needs 12v to start but only runs on 9v to run (runs thru a resistor wire). The HEI you should have on the BB needs 12v all the time (I ran mine from the fuse block IGN UNFUSED) and the starter only needs the wire from the ignition switch.

I hope that made sense.

Longhorn Man · 10-01-2005, 05:55 AM

Make sure the purple wire is on the S terminal on your starter. if you are running an HEI coil, then delete the yellow wire that was on the starter, and then up top, also delete the cloth overed coil wire. This is a resistance wire that will knock the voltage down. Your HEI will need a full 13 volts. Simply run a wire from the ignition unfused plug on the fuse box, and run it out to the HEI's BATT terminal.

10-01-2005, 01:48 AM	#1
hewl35 Registered User Join Date: May 2005 Location: Merriam, KS Posts: 13	Engine Swap Electric Problem I've got a 70 C-10 with a transplanted 454 from a 76. The 454 starter has only one wire to the solenoid not two like the other starter had. I threw a battery in and the motor didn't crank but I have good lights, etc so I'm sure the grounds are good. What do I need to do to the wiring harness to get the motor to crank? I'm sure it something simple. Thanks Jeff

10-01-2005, 01:56 AM	#2
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	The original wiring had one wire from the ignition switch (purple I think) and one going to the coil. The points ignition needs 12v to start but only runs on 9v to run (runs thru a resistor wire). The HEI you should have on the BB needs 12v all the time (I ran mine from the fuse block IGN UNFUSED) and the starter only needs the wire from the ignition switch. I hope that made sense. __________________ "If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck"

10-01-2005, 05:55 AM	#3
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Make sure the purple wire is on the S terminal on your starter. if you are running an HEI coil, then delete the yellow wire that was on the starter, and then up top, also delete the cloth overed coil wire. This is a resistance wire that will knock the voltage down. Your HEI will need a full 13 volts. Simply run a wire from the ignition unfused plug on the fuse box, and run it out to the HEI's BATT terminal.



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