Sounds like the gauge needs to be calibrated as per this site:
http://mgaguru.com/mgtech/electric/fg_10.htm
John
64/66 BJ8s
On 1/16/2011 1:04 PM, Rick Huber wrote:
> Sorry, don't know how the last message got sent, somebody must have hit
> something on the keyboard.
>
> Problem - tank reads 5/8 full when empty and needle is out of sight past
> full when full.
>
> Troubleshooting. With tank full, voltage at Battery side of gauge is 12 v,
> Tank side is 1.6 v. Resistance across gauge is 62 ohms when completely
> disconnected.
> With tank empty (out of gas), voltage at sending
> unit is 7 v.
> With sending unit out of tank, resistance at full
> down position is 85 ohms, voltage when grounded is 7 v, gauge reads 5/8
> full.
>
> resistance at full up position is 1.5 ohms, voltage when grounded is 0.5 v,
> gauge reads out of sight past full.
>
> Anybody know what's wrong?
>
> Cheers,
> Rick
> 64 BJ8 Phase I
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