73-87 Chevy _ GMC Trucks > Electrical
fusible link
Lt.Del:
I think I may have a fusible link problem.
The other day, I drove my 383 stroker 79 big 10. I noticed, as I parked the truck and revved the engine up, the Alt guage went well into the orange area, showing over 18 volts. I let it idle, and the volts went down to normal. Revved it up again, and she went way over into the orange area again.
I shut her down and figured perhaps my voltage regulator may be in need of attention. I didn't worry about it for a few days. Went out to turn the truck on again today and it is as if the battery was dead, all the way dead...no buzzer, light, no radio, etc..
I put a guage on the batter, it shows 12.44 volts. PUt a battery charger on it just to see something, and the guage shows she gets 18 volts w/ charger attached. Turned the key on, still no buzzer, light, dome light, not even the headlights. Dead!
So, I am wondering if i have a fusible link problem. Anyone ever have a similar problem?
I need to figure out where to try to replace the fusible link. I understand that there may be four of them on my 79.
A) starter solenoid Batt terminal, 14 guange red wire
B) 16 guage at junction block
C) Battery feed to voltage regular #3 terminal (molded splice in circuit at junction block)
D) Ammeter circuit is protected by two 20 guage gusible links as molded splices in circuit at junciton block and battery to start circuit.
What? ???
Any one have pics or pointers?
Is this one?...
or this?....
123 pugsy:
Those are both fusible links. Use your ohmmeter and stab the probe points into the wire on either side to check for continuity.
Lt.Del:
Guys, you will not believe this!
I was going to check various places to see where I get 12 volts in the circuits and I looked down below the battery. The long positive cable that goes from the battery to the starter, where it routes over the frame near the tranny lines, was completely melted into two pieces!
I don't know why this didn't start a fire (well, it probably did and nothing else flammable around that area). I guess the cable had a little copper showing through until finally it rubbed onto the negative grounded frame and completly burned into two. Why the battery didn't blow, i don't know. She still holds a great charge.
I guess my fusible links are just fine, it happened just about a foot and a half below the posi. battery terminal.
Perhaps all i need is another long posi cable to route back to my starter.
Boy that is scary. My 2 1/2 yr old son was with me on my last trip with the truck the other day...and you can't get a kid out of those child-safety seats in a hurry. :o
That would be the reason i have absolutely no volts at all anywhere on the truck. I guess this is the reason, on my last trip, the alt was putting out over 18 volts trying to compensate for the voltage loss. I dunno ???
78rustbucket:
wow, never seen that before. good thing nothing serious happened over it. im sure vehicles have burnt down because of a much smaller short.
75 C20:
--- Quote from: SgtDel on July 16, 2007, 08:06:25 PM --- Why the battery didn't blow, i don't know. She still holds a great charge.
--- End quote ---
hahah that reminds me of awhile bak when i 1st had my 79 i turn a corner in town a lil fast and my battery was just sitting there decided to come out and short out on my inner fender- my truck stoped runing and smoke came out from under the hood- luckily i rolled down the block to the gas/service station where i work. i jumped it and the battery has held great chrage and hasnt given me trouble yet i had just bought that attery like a week before
Navigation
[0] Message Index
[#] Next page
Go to full version