May 26, 2005I'm struggling with my fuel gage. I have a 1993 Allegro Bay Diesel Pusher motorhome (Oshkosh Chasis) with a fuel gage problem. Originally the fuel gage pegged at full. Then I replaced the fuel gage. Now it pegs at empty. I have four posts on the rear of the gage marked "I", "G", "S", and the 4th is not marked. The 4th is the lamp. I'm assuming "I" is "power", "G" is ground, and "S" is "sending unit signal". The 4th is 12Volts connected to the lamp. Access to the sending unit is tough . . I need to drop the tank. Even tho the fuel gage is new, I can't assume it's good since I accidently dropped it before installing. I'd appreciate any help/advise I can get to test/diagnose my problem?
Forums : Electrical : How to test a fuel gage sending unit (601 Views)
Subscribers : Dieselhog
May 26, 2005Man, you've got me confused on this one ..... Every vehicle I've ever worked on had only two wires for the fuel gauge. One 12 volt power lead to the gauge, and the other to the sender. The sender is variable ground type, kind of like the controller for a slot car. The more you squeeze the trigger the faster the car went, well with the sender, the higher the float level, the more grounding of the unit. Full is totally grounded and empty is no ground at all â€¦. Like I said â€¦ thatâ€™s the way Iâ€™ve seen them work â€¦..