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my buddy has one and Im going to put in my old pioneer HU for him, his battery wire (constant) has no current. The ignition is fine, it has 12volts but not the constant. Im thinking it might be a fuse, I looked under his fusebox under the hood but didnt see a radio fuse.

1.) could this fuse be called something else?
2.) is there more than the fuse box under the hood? like one in the cab?
3.) do I just need to run another wire from the battery? thanks.

There is probably another fuse box under the dash...

There is a second fuse box under the dash, or beside the dash next to the door opening, and yes the 12v for the radio does run thru it.

alright thats it, thanks you guys.

obviously im guessing its the one called "radio batt." ? He said it was blown and he replaced it and it blew again. I dont see how there could be anymore current than from the last deck he had in. He replaced with same size, i dunno whats up, I wasnt there when he did it so maybe he did something wrong.

He might have pinched a wire when he slid the deck in, or wired it wrong. Have him pull the radio out and double check all the wires.

figured it out. He had the car on when he replaced the fuse so it just blew on him. He put another one in with everything off and it all works now. Thats successful install # 4 for me. woohoo