Question about 1987 Ford Bronco II
Replaced the fuel pump in the tank with a sending unit (new) and that didn't fix the problem. Connections seemed clean and fine at the tank. Traced wiring with Haynes manual under the hood; a yellow w/white stripe wire should be the + wire from the sending unit of the fuel tank. I hooked a test light (ground was to the neg of the battery) to the back of the connector of this wire (under the hood by the firewall) and got about 1 second flashes and the fuel gage read about 1/2 tank (I think it should be 3/4 full as I filled it up and haven't ran it that much). Thought it must be a ground issue so hooked jumper wire from ground to the y/w wire and it pegged out past full on the fuel gage. Hooked VOM to the backside of the yel/wht wire at the connection under the hood by the firewall and it jumps from 0 to about 6-8 volts on an analog meter (still about 1 second between jumps). It appears the sending unit in the fuel tank is putting out a signal but it is not registering on the fuel gage. I have not pulled the yel/wht wire out of the wiring harness loom under the vehicle to check for shorts (or the black ground wire either for that matter). What should be done next?
I need to know if the other gauges are accurate. There is a voltage regulator mounted on the back side of the dash that can go bad and often does, that will make the other gauges inaccurate also.
Posted on Dec 02, 2008
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Posted on Jan 02, 2017
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