Amp problem

[keyser318]

Hello,

I have an amp that is about 25 years old. Worked fine when I took it out after 3-4 years of use. It sat unused. I got the urge to install it and upgrade the amp to the sub in my truck. I ran the 8 gauge cable to the battery. Grounded it to chassis, I don’t think I had a good ground. So I grabbed jumper cables to just get it mocked up and make sure I had stuff hooked up right before final mounting and make sure I had a good ground. As soon as I attach either the ground or the positive the fuse immediately pops. I took everything off load side to make sure there wasn’t a short occurring from something else. When I tell continuity between positive and negative terminals, they are not shorted. Am I missing something?

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[Doxquzme Premium Member]

When a fuse immediately blows upon connecting the battery's positive or negative cable, it indicates a direct short circuit somewhere in the system

Have you opened it up to see if anything leaked (caps) or looks to be shorted or charred?

 

[shredder1 10+ year member]

As soon as I attach either the ground or the positive the fuse immediately pops. I took everything off load side to make sure there wasn’t a short occurring from something else.

Sounds like a dead short and most likely a big one. Power and ground reversed? A newly installed cable may be at fault but something is off.
The amp has fried and the caps have degraded the board even?

 

[Jimi77 Premium Member]

Sounds like a dead short in the power supply side of the amp.