Ok so I have a 1995 isuzu pick up I just got a few weeks ago. Thing needs some work.

While I am here on the topic, I have no heat in truck, I test 12v and nothing at wires.

Replaced fuses and swapped out relays nothing. Tested here and there. No luck

End up putting 12v to the blower motor and it does work, however no power to the 2 wires. Now thing is I test fuse sites. for 12v ignition on. Some have power others dont.

Next I remove fuse box and take apart bottom portion where wires are. I notice a black wire with a silver dot- which is melted out. Exposed copper and corroded patina. Not sure what it even goes to. I need to figure out how to get the heat or blower working again.

I know I can grab a hot from some where but I would like some direction on how to trace out or figure out whats going on here. No 12v to the wires or anything

THanks