Reply to "Fuel gauge fuse blowing on me."

jfb05177Member

Just looking at the schematics, I was a little concern that the fuel sender went to 0 ohms at "full". ie 0 ohms being a short circuit and thus a LOT of current. SO I went and checked my gauges and determined they appear to have internal current limiting resistance. the fuel and water gauges were 130 ohms and the oil gauge 82 ohms.

assuming the worst case of all three gauge senders were 0 ohms (grounded) the effective resistance of the three gauges would be 37 ohms; thus only about 2 1/2 amps

the original wiring for fuse 12 should have the brake lamps, backup lamps and a radiator fan motor besides the gauges. if these devices are OFF, then the fuse resistance should be greater than 37 ohms (working senders will increase resistance. light bulb's resistance are very low when not hot

5/17/1512:40 PM

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