Puzzled

[lopez2126]

Had a no start condition on my 85 C10, replaced mechanical fuel pump. Removed ignition coil for a visual. Looks brand new. Put it back in. As I attempted to connect negative battery cable I noticed some arching I continued. Fusible link at junction block started smoking. I quickly disconnected battery. Today I repaired the link with some 12 gauge wire. Still arching when connecting battery cable.

 

[DoubleDingo]

Do not compromise the wiring system by using wire in place of fusible link. Address that first or you'll burn your harness and/or truck down.

 

[89Suburban]

Do not compromise the wiring system by using wire in place of fusible link. Address that first or you'll burn your harness and/or truck down.

Yup definitly has a short somewhere.

 

[PrairieDrifter]

Check wiring to the starter. I'm sure there's a melted mess behind the passenger side of the block.

 

[lopez2126]

Thanks everyone. Everything was fine 4 days ago when I took my truck for a drive. Then all of a sudden, it did not start. I’ll start tracing some wires tomorrow see what I can find…

 

[PrairieDrifter]

Thanks everyone. Everything was fine 4 days ago when I took my truck for a drive. Then all of a sudden, it did not start. I’ll start tracing some wires tomorrow see what I can find…

That harness sounds like the culprit.

 

[R Carnella]

It's also possible a diode has shorted in the alternator. Disconnect the battery wire from the back of the alternator and see if the short goes away