1986 Chevrolet Silverado Electrical I think

Tiny
JV11
  • MEMBER
  • 1986 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 4WD
  • 150,000 MILES
No dash lights or ignition
Replaced starter switch
Checked fuses
Tested starter
Ripped apart wire harness testing
1/2 the fuse panel doesn't work
Headlights and horn and dome light still work
Radio dash ignition flashers and heater are all out
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Monday, January 27th, 2014 AT 9:33 AM

8 Replies

Tiny
HMAC300
  • EXPERT
Check the fusible links connected to starter, one of a couple may have failed.
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Monday, January 27th, 2014 AT 1:17 PM
Tiny
JV11
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I found a red wire from the starter burnt out and the end from the starter was live so I spliced the ends together and now I have dash power and heater fan when I turn the key but it won't turn over. Trying to check if maybe it damaged another wire in the harness when it burnt out. Any thoughts? All fuses show power now but fuse marked int. Battery showed low so I hooked another old battery to it with jumpers so it read it the middle and still nothing.
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Monday, January 27th, 2014 AT 1:34 PM
Tiny
HMAC300
  • EXPERT
Check all the ones I have in the pic they are clearly marked where they are. Sounds like more than one burnt up
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Monday, January 27th, 2014 AT 3:13 PM
Tiny
JV11
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I'll get back at it in the morning. Thank you for the help. I'll reply after I search further.
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Monday, January 27th, 2014 AT 3:27 PM
Tiny
JV11
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Hi. I've been checking all the wiring under the hood and I still have no ignition. I found a light blue wire that is live when the key is turned on. It comes out of a sensor I believe that is under the back side of the distributor. It almost looks like it clips into the back of the engine. Can't really see. I can't figure out what the loose end of the wire goes to but it has to power something. The clip it comes out of also has a brown w white stripe and a dark blue wire coming out of it. I believe they go into the firewall to the ECM? The ECM looks like it has a light blue wire coming out of it the same color and with a test light it has no power. Any thoughts? I couldn't find any more bad fusable links and still have dash power but no crank or headlights. Thanks
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Thursday, January 30th, 2014 AT 2:48 PM
Tiny
HMAC300
  • EXPERT
The red wire you cut then put directly to the starter needs a fusible link otherwise your truck will catch on fire that is what its' there for. Check all these other ones thenit will probably start you probably have another one or two burnt up.
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+1
Thursday, January 30th, 2014 AT 3:16 PM
Tiny
JV11
  • MEMBER
Starter to the altenator is good. Altenator to the junction block on the firewall I replaced. It had an inline fuse already wired in and I replaced the 30 amp fuse and a new wire even though it wasn't blown. And I put a new fusable link in from the starter to the junction block. I have power to all. It's not a diesel and there is no auxiliary battery. Am I missing one? Should only be 3 right? I know there are more in the diagram you sent but I think I covered it.
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Thursday, January 30th, 2014 AT 3:43 PM
Tiny
HMAC300
  • EXPERT
Ya I think you got them all ok on tis pic see if the large wire on starter has same power as battery like 12.4 with no start. Then seeif the purple wire gets power when youtry to start it. It is the "S" terminal on solenoid. If not then it's either the ign switch or the neutral safety switch isn't letting it go through.
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Thursday, January 30th, 2014 AT 3:51 PM

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