Big _Betsy_Red
Full Access Member
- Joined
- Nov 2, 2020
- Posts
- 61
- Reaction score
- 14
- Location
- Western Massachusetts
- First Name
- Wil
- Truck Year
- 1984
- Truck Model
- Blazer
- Engine Size
- 350ci
A couple of years ago I replaced the entire wiring harness (painless wiring) from headlights to tailights and I am very happy with the results except for the gas gage. I also replaced the printed cuircuit. When hooked up normally to the gage cluster/printed curcuit she would always read over full. A few months ago I dropped the gas tank and made sure I had a good ground at the sending unit by hooking a long wire from the battery positive to a light bulb and back to the chassis via the ground wire for the sending unit. While the empty tank was out I checked the resistance of the sending unit with the tank upright and upside down and it gave a typical change. I also sent a borescope into the tank and she is mint. Then I cleaned up the connections on top of the sending unit and got a new connector for the signal wire to the gage cluster. This past weekend I tried hard wiring the gage to the battery via the extra ignition on power wire for the power windows that I don't have (she has good old fashioned roll up crank windows). I also spliced into the signal wire right at the printed cicuit in the dash and grounded back to the ground block next to the parking brake pedal that is hard wired to the battery because she is a little rusty under there. I used my Hayens manual cicuit schematic (attached) noting that the fuel gage on the schematic has the needle displayed for what I assume to be orientation to wire right to the terminals on the gage, bypassing the printed cicuit. I tried two different guages and switched the orientation of the ground and signal wires and everytime she was reading below empty. Any ideas? Do I just need to run a new wire from the sending unit to the terminal that plugs into the printed curcuit?
