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Fuel gauge question

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Old Aug 6, 2018 | 09:48 PM
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Default Fuel gauge question
My fuel gauge jumps to full instantly when bike is started, also the air temp gauge does the same.
So that's the two gauges on the left, I think they have the same problem, but I don't know what it is, or what to check.
Any ideas?

Thanks

The fuel sending unit is not stuck.

97 FLHTCUI
 
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Old Aug 6, 2018 | 10:28 PM
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You have a bad ground.
 
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Old Aug 7, 2018 | 03:55 AM
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Also check connectors, as high resistance can sometimes cause problems. Make sure they are clean and tight.
 
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Old Aug 7, 2018 | 09:17 AM
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Bad ground sounds about right to me.
That's going to be a lot of fun trying to find I bet.
 
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