is this what this circuit is actually for? pic attached

[MikeB]

Originally Posted by JesseA422

no, it is a constant batt + on connection, fused by the fuse right below it.

What do i need to trace to try and find what is causing this to pop, without anything connected to the terminal?

OK. Interesting that the connection isn't labeled BAT. By ACCY, they mean it will power an accessory directly from the battery through the fuse below it. That's a first for me.

To trouble shoot, start by disconnecting the battery and measure the resistance from the the single ACCY terminal to ground. That's the "ohms" position on the multi-meter. If it's zero or close to zero, there is a short to ground somewhere. But since the radio power wire is no longer connected, it would have to be in or behind the fuse panel.

Also, measure the DC voltage on each of the ACCY terminals and both fuse terminals with the battery connected. I assume you will see 12 volts on the lower fuse terminal.


FYI, here's a fuse panel from an 81 truck. Notice how direct-to-battery terminals are labeled BAT, and terminals powered by the ignition switch are labeled ACCY -- and none of them are fused.