70 C20 no power!! HELP!!

[A1971Blazer]

Originally Posted by DEESTER157

Thanks for the diagrams and replies guys and thanks for the fuseable link def Lock! That makes perfect sense. Ill have to pick one up on my way home today. I think that solves that problem. Does anybody have any idea what the light green and dark green wires are that go down to my starter are? Thanks

if they're the factory wires...the light green and dark green are for the backup lights....they shouldn't be attached to the starter...anywhere...

[DEESTER157]

Well the purple is the ignition switch and yellow is to the coil. In this same wire loom going down to my starter i have a light green and dark green. They come out exactly where my purple and yellow do for my starter so im confused about what they are. Any thoughts? I may have to take a picture.

[VetteVet]

Originally Posted by DEESTER157

Well the purple is the ignition switch and yellow is to the coil. In this same wire loom going down to my starter i have a light green and dark green. They come out exactly where my purple and yellow do for my starter so im confused about what they are. Any thoughts? I may have to take a picture.

As stated the light green and dark green wires are used for the backup light lights circuit, but they are shown in the diagram and do not go to the starter.

We have had discussions in a thread about using the starter solenoid to actuate a relay for the fuel pump(electrical), also to provide ignition power during starting when an oil pressure switch is used, to kill ignition power in the case of an accident or in case of low oil pressure. I have developed an idea for a theft deterrent using the R terminal on the starter which requires additional wiring, but in a stock configuration there are no other wires than the purple and yellow going to the starter solenoid.
It is incumbent on you to trace out these wires and see where they go. Possibly they are for an alarm system.

[DEESTER157]

Ok i see the green wires in the diagram going to the backup light switch so i know where those go now. Any idea where this switch is at under the hood so i can hook these up? Thanks

[VetteVet]

Originally Posted by DEESTER157

Ok i see the green wires in the diagram going to the backup light switch so i know where those go now. Any idea where this switch is at under the hood so i can hook these up? Thanks

The back up light wires originate at the fuse panel and they are reall just one wire.The dark green wire from the fuse panel goes to the NSS on the steering column(automatic trans) and to a switch on the standard trans and thence to the rear lights. After it leaves the switch it turns to light green.

[DEESTER157]

Ok, well they are kinda one wire (two wires but plastic coating is attached together side to side). Someone switched my truck over to a 700r4 so that would explain why these are not hooked to anything. Did these go to a switch that was actually on the manual trans or a switch under the hood. Im assuming they both go to this switch.

[VetteVet]

Originally Posted by DEESTER157

Ok, well they are kinda one wire (two wires but plastic coating is attached together side to side). Someone switched my truck over to a 700r4 so that would explain why these are not hooked to anything. Did these go to a switch that was actually on the manual trans or a switch under the hood. Im assuming they both go to this switch.

Referring to my previous post this is the neutral start switch. It is mounted on the steering column of trucks with automatic transmissions It shares the backup light wires with the purple starter solenoid wires and it connects the green backup light wires when the shift selector is put into reverse. You will need the plug that connects the two wires to the Neutral start switch.
The backup lights operate off this switch and are not dependent on which automatic transmission you have in the truck.

If you had a truck with a standard shift transmission the switch would be mounted on the transmission and the green wires would go there.

here is a picture of the column switch. I had a picture of the NSS with the wires attached but I haven't found it yet.





OK here you go.