fuel gauge OHM?
Champion
Joined: Dec 2003
Posts: 4,119
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From: Sycamore, Illinois (displaced to Arkansas)
RE: fuel gauge OHM?
From the 2001 service manual:
But just a paragraph later, it states:
I guess you can add resistance to an electrical line and voltage will go up 
.
If '99 is similar to '01 (which I wouldn't see why not), doesn't look like it will work with your truck. But it looks like they do have differance kits.
My '96 works on a similar scale as what you say most GMs work on (90 ohms at empty, ~10 ohms at full). I'll have to check that out.
output voltages will vary from about 0.6 volts at FULL, to about 8.6 volts at EMPTY (about 8.6 volts at EMPTY for Jeep models, and about 7.0 volts at EMPTY for Dodge Truck models) ... As fuel level increases, the float and arm move up, which decreases voltage. As fuel level decreases, the float and arm move down, which increases voltage.
Measure the resistance across the sending unit terminals. With float in up position, resistance should be 20 ohms ±6 ohms. With float in down position, resistance should be 220 ohms ±6 ohms.
.If '99 is similar to '01 (which I wouldn't see why not), doesn't look like it will work with your truck. But it looks like they do have differance kits.
My '96 works on a similar scale as what you say most GMs work on (90 ohms at empty, ~10 ohms at full). I'll have to check that out.
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Joined: Aug 2006
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RE: fuel gauge OHM?
You happen to know if unhooking the fuel gauge causes any error codes or lights? I was thinking about, I don't even really care if I have a fuel gauge as I don't use my truck for daily driving.