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77 ChevPU 350ci Electrical system shutdown.,

ray1941

LawnSite Member
1977 Chev PU 350CI. I have experienced complete electrical shutdown. Truck was running great 3 days ago. Applied booster battery.Battery in truck checks good. Not even a peep or groan was heard. None of the insruments are working. Checked all accessible wire connections.Please advise where I should start to look. Thanks to all that reply. Much appreciated.
Ray
 

plowking35

LawnSite Bronze Member
Location
S.E. CT
Up under dash behind steering colum look for a large ground buss. If that isnt it look for the large electrical connection on the firewall. My bet is a ground somewhere.
Dino
 

Chuck Smith

LawnSite Senior Member
Location
Nutley, NJ
There is a fuseable link inline in the power supply wire. It sounds like it fried. This can happen easily if jumper cables are hooked up wrong, even for only a second. That's why the fusable link is there, to protect the other wiring. They also just can go bad for no apparent reason, though it's rare.

The fusable link is usually located under the hood, on the firewall, just above the distributor. It's inside a small piece of braided nylon covering.


Also, use a test light, and see just how good the ground point is on the alternator bracket where the ground wire from the batery attaches.

As Dino mentioned, grounds are very important, and are responsible for about 80% of all electrical troubles.

~Chuck
 
OP
R

ray1941

LawnSite Member
Thanks Chuck
Your suggestion to check the fusible link was right on. I by passed the link with a jumper. The truck sprang back to life. Will replace the link.
Regards
Ray
 
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