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#1 |
Registered User
Join Date: Aug 2012
Location: San Jose, California
Posts: 96
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Did something stupid today
Long story short is I had the battery and the alternator both disconnected for some electrical work and I reconnected the battery before the alternator. The wire for the alternator was touching the valve cover and there was lots of sparking there and also at the junction box on the firewall. Now I just have exterior lights and the courtesy/dome light, nothing else. Did I fry the fusible link at the junction box? Did I damage anything important? How do I fix this?
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#2 |
Registered User
Join Date: Feb 2015
Location: Bonham, Texas
Posts: 241
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Re: Did something stupid today
Well atleast most of these trucks are not computer controlled, if your truck is there is a huge chance you killed that computer.
If you are lucky you only killed all the fuses. So I'd disconnect the battery, leave the alternator plugged in, and check all the fuses. Lucky for us, the fuses are all transparant and are pretty obvious which ones blew. Check all of your wiring, make sure nothing melted. It would be a big problem if a hot wire melted and is now causing a short somewhere. Based on my experience when my starter system shorted out, your neutral safety switch might be dead now, which may not allow your truck to crank. I'm going to assume your fusible link is fine since your lights work. So really all you can do is check the wires, try new fuses and see if it starts. |
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#3 |
Registered User
Join Date: Dec 2013
Location: Humble, Texas
Posts: 185
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Re: Did something stupid today
Year model?
__________________
I know the "VOICES" aren't real but they have some great ideas. 1978 GMC Sierra Classic C25 1983 Datsun 280ZX Turbo 1997 Chevy Cheyenne K2500 1999 Polaris Sport 400 |
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#4 |
Registered User
Join Date: Dec 2013
Location: Humble, Texas
Posts: 185
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Re: Did something stupid today
I looked at your profile and on your 86 you should have 3 fusible links. 2 at the starter and 1 at the junction block. Easy way to check them is to pull on the wire. If it stretches or breaks it is bad. If you have a multi-meter you can ohm them out end to end. See attached diagram. Buddy
__________________
I know the "VOICES" aren't real but they have some great ideas. 1978 GMC Sierra Classic C25 1983 Datsun 280ZX Turbo 1997 Chevy Cheyenne K2500 1999 Polaris Sport 400 |
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#5 |
Registered User
Join Date: Aug 2012
Location: San Jose, California
Posts: 96
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Re: Did something stupid today
Thank you!
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#6 | |
Registered User
Join Date: Aug 2012
Location: San Jose, California
Posts: 96
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Re: Did something stupid today
Quote:
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#7 |
Registered User
Join Date: Dec 2013
Location: Humble, Texas
Posts: 185
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Re: Did something stupid today
The wire with the pellet in it. Pull on the pellet away from the junction. If it breaks it is burnt. The fusible links are designed to melt inside the insulation. The pellet is the splice between the regular wiring and the power source. You also need to look at the starter solenoid for two more wires with pellets connected to the large post. See diagram above. The section of wire between the pellet and the eyelet at the end is the link. Buddy
__________________
I know the "VOICES" aren't real but they have some great ideas. 1978 GMC Sierra Classic C25 1983 Datsun 280ZX Turbo 1997 Chevy Cheyenne K2500 1999 Polaris Sport 400 Last edited by buddy_1; 03-01-2015 at 11:59 PM. |
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#8 |
Registered User
Join Date: Feb 2015
Location: Santa Rosa, Ca.
Posts: 539
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Re: Did something stupid today
Head lights are not fused, a Federal safety measure. that's why they still work.
Yes that is a fusible link at your junction block. The one with the fat black band around it. A fusible link is nothing more than a wire 2 gauges smaller than the wire it feeds to. fusible link wire is only different from regular wire by its insulation. It is a hypalon insulation so it does not burn and melt like the standard plastic covered wire. parts stores like Napa sells hypalon wire in various gauges.
__________________
1977 Chevrolet C/10 Silverado. Step-Side, Factory 454, TH400, 3.73 Posi 12 Bolt. 1975 Chevrolet El Camino. 350, TH400, 3.08 Posi 10 Bolt. |
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