I'm starting with the fuel gauge because I need it the most. All the gauge lights work.
I checked the gauge operation with a jumper wire and it seems to work fine. I replaced the tank sender and that did not fix it. I traced the sender ground wire from the sender flange to a cluster of black or dark wires that was conected to my + pos. side on the cranking battery. Now I must assume that I somehow got the wrong wires on the wrong battery terminal.
I'm lost. Any idea how many wires the boat uses for pumps, lights, gauges,etc..... and which terminal they should be on? There is a wire with a fuse or somthing on the ground side. That don't seem right either.
1988 Blazer VL120 16ft.

Maybe I should just cut a big hole in the top of the tank and I can use my cigarette lighter to look down in there and see how much gas I have.

HELP!!! S.O.S.!!!!

Any help is greatly appreciated.