The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 68 C10 Yellow wire from firewall to starter/coil.

**VetteVet** · 04-04-2011, 11:03 PM

Another possibility is the diode in the alternator. Before you pull the HEI wire you should disconnect the plastic plug in the alternator and the external regulator plug if it has not been converted to an internally regulated alternator. If the engine dies than it is most likely the diode in the alternator. It may charge just fine when it's running but it will back feed the ignition circuit if the diode is shorted through.

04-04-2011, 11:03 PM	#8
VetteVet Msgt USAF Ret Join Date: Jan 2005 Location: Kalamazoo, Michigan Posts: 8,703	Re: 68 C10 Yellow wire from firewall to starter/coil. Another possibility is the diode in the alternator. Before you pull the HEI wire you should disconnect the plastic plug in the alternator and the external regulator plug if it has not been converted to an internally regulated alternator. If the engine dies than it is most likely the diode in the alternator. It may charge just fine when it's running but it will back feed the ignition circuit if the diode is shorted through. __________________ VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative.