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Old 10-17-2020, 10:17 AM   #1
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Fuel Gauge

RE: 2004/05 WRV, Alpine Coach.

Our mechanic in Oxnard, CA, requested us to find out if anyone could let us know where we can get the electrical wiring diagram or any other diagram to fix the fuel gauge. The gauge moves back and forth in a constant motion and will not set to display the actual level of the fuel. He thinks because of the constant movement back and forth this may be an electrical problem without having to look at the sending unit near the fuel tank.
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Old 10-17-2020, 03:15 PM   #2
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Have him check the ground wire at the sending unit. If it is loose or corroded it can cause the problem that you have described.
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Old 10-17-2020, 04:03 PM   #3
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I don't think there is a "wiring diagram" exactly as the Actia gauges are digitally controlled. As RVPioneer said he should probably check the sending unit. The sweeping motion of the gauge needle is the proper self diagnostic that is done once every time on start up (unless it has been turned off in the setup program). The gauge set is looking for somewhere between 30 ohms empty and 240 ohms full from the fuel gage sending unit. If it is out of that range you could get the never ending sweeping routine. The sender can be checked at the wire terminals in the wheel well or if you know how there is a diagnostic mode you can use on the gauge display. Failure of the sending unit seems to be fairly common.
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Old Yesterday, 10:56 AM   #4
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Mechanics 101, always look at the fuel sender first. A multimeter and ten minutes will save you a lot of frustration. Fuel sender should be 0-90 ohms resistance depending on fuel level. Grounding the sender wire should send the gauge to zero...or full depending on how it's manufactured. A half tank of fuel should be somewhere in the 45 ohm ballpark. Fuel sender is easy to access on Alpines. Yes, check that ground wire first.
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Old Today, 07:22 AM   #5
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Thank you.
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