Ignition switches wirin

[THE-HOG]

I put whole new wiring harnesses in my 75 w100 with the 5.2 & it cranked then, put a new ignition switch in and now it doesn't crank. The switch has 2 thick wires and 4 small wires. My big wires are correct but I don't think my small ones are and I can't figure out a way to correct it.

 

[65 sporty]

I did some searching and found this, but you said you have 6 wires

 

[58pwrwgn]

You need to find the wire that is only hot when the key is turned to hot. This needs to be connected to the wire going to the starter relay.

 

[58pwrwgn]

Are you using the 5.2 computer. If so does that control the starter relay

 

[THE-HOG]

I did some searching and found this, but you said you have 6 wires



View attachment 24786

I already have a book for my truck but the Napa ks6691 (?) ignition switch has a brown black red yellow brown blue and a skinny black. Wiring harness has the book-match red pink, orange, skinny orange, black, blue/light blue,

 

[THE-HOG]

Are you using the 5.2 computer. If so does that control the starter relay

I do not believe so, how do I tell?

 

[58pwrwgn]

I looked up napa ks9961 for a wire diagram but get a Ford switch. I you have an ohm meter, find out which pair of wire give you continuity when the switch is turned all the way to start. Or if you have the 12v power lead hooked up, find the one that gives you 12v when turned to start. By the wire diagram , if correct, above this wire should connect to the yellow wire on the harness