'76 Fuel Guage Refusues to Work

[Knightpilot]

I've posted this on Broncofix.Com. I'm new here and thought I would try posting it here as well: Here's the summary so far: I have electricity going to the guage and leaving the guage. I've tested the guage using 2 "D"' cell batteries and it read 1/2 full (perfect, so guage works). The juice (volts) then flows to the fuel selector switch and leaves the switch just fine. The juice makes it all the way to the plug that goes into the fuel sensing unit. I cleaned the contacts for the unit and sprayed some contact fluid on it for good measure. Next, I put a wire brush on my drill and brushed the ground wire and everything associated with the ground wire. Next I measured the ohms across the sending unit and it read 10 ohms (because the tank is full). I went and checked the guage and the damn thing still reads zero.

My only thought is that the voltage coming out of the IVR is not constant - it fluctuates between less than one volt to six volts (hanging out around the 1 volt range with an occasional spike up to 6 volts). Can this be the only remaining problem? I would think the voltage from the IVR would be fairly constant around 5-6 volts. I hate to beat this issue to death, but I just can't get this thing to work. Thanks for your input. John (I just realized that I mispelled "refuses", but I can't change it).

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76 Bronco, 302, Auto Complete Rebuild

 

[freeheelbillie]

I've posted this on Broncofix.Com. I'm new here and thought I would try posting it here as well: Here's the summary so far: I have electricity going to the guage and leaving the guage. I've tested the guage using 2 "D"' cell batteries and it read 1/2 full (perfect, so guage works). The juice (volts) then flows to the fuel selector switch and leaves the switch just fine. The juice makes it all the way to the plug that goes into the fuel sensing unit. I cleaned the contacts for the unit and sprayed some contact fluid on it for good measure. Next, I put a wire brush on my drill and brushed the ground wire and everything associated with the ground wire. Next I measured the ohms across the sending unit and it read 10 ohms (because the tank is full). I went and checked the guage and the damn thing still reads zero.
My only thought is that the voltage coming out of the IVR is not constant - it fluctuates between less than one volt to six volts (hanging out around the 1 volt range with an occasional spike up to 6 volts). Can this be the only remaining problem? I would think the voltage from the IVR would be fairly constant around 5-6 volts. I hate to beat this issue to death, but I just can't get this thing to work. Thanks for your input. John (I just realized that I mispelled "refuses", but I can't change it).

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76 Bronco, 302, Auto Complete Rebuild

Follow the yellow wire from the sending unit all the way behind the dash what you have plugged into the guage may not be right. If that does not work replace the sending unit all together (50.00) and you can do it without dropping the tank. Be sure to disconnect the ground on the battery and drain the tank before hand!!!

I had the same problem a couple of weeks ago...also be sure you AUX/MAIN switch is on the correct tank.

Hope that helps!

Billie

 

[Bully Bob]

WOW...!

-----what FHB said., plus;

If all questions were this thorough....the possibilities are endless...!! >

At this point., all I can ask is...what are the oil press. & temp. gages reading, as they are powered by the volt. reg. as well.

The reg. should have a steady {+- 6v} but as I recall., it pulsates.

When the key is turned 'on' ...the oil pres. needle should slowly move toward the lowest notch.