Pat,
The black wire is zero (ground).
Guess I'll try to work my fingers up behind the gauge and check for continuity.
Thanks.
- Bob
> On May 9, 2020, at 16:53, Pat Horne <patintexas@icloud.com> wrote:
>
> Bob,
> That sounds a bit off. The 7.6v on the yellow wire to ground is fine, but the
> black wire should be zero.
>
> When you ground the yellow wire to the body, the gauge should go to max.
> Sounds like you have a bad fuel gauge. Just to be sure you can try grounding
> the terminal on the gauge that the yellow wire goes to.
>
> Peace,
> Pat
>
> Pat Horne
> We support Habitat for Humanity
>
>
>> On May 9, 2020, at 3:09 PM, RWM <RWM@rwmann.com> wrote:
>>
>
> Pat,
>
> With ignition switch in running position
>
> Yellow wire to chassis is 7.6 volts, same as to black wire
>
> Yellow wire to ground, no gauge deflection
>
> Thanks
>
> - Bob
>
>
>> On May 9, 2020, at 13:19, Pat Horne <patintexas@icloud.com> wrote:
>>
>> Hook everything back up except the sender. Turn on the key & measure for
>> voltage @ the sender wires to ground. One should show voltage & the other
>> should be grounded. (Not home now to get colors) ground the one with
>> voltage. If the gauge still sits on empty you have a bad gauge. If there is
>> no voltage it could be a bad connection or a bad gauge. Let me know what
>> yâ??all find & Iâ??ll walk you through more diagnostics.
>>
>> Peace,
>> Pat
>>
>>
>> Pat Horne
>> We support Habitat for Humanity
>>
>>
>>>>> On May 9, 2020, at 11:02 AM, RWM via Datsun-roadsters
>>>>> <datsun-roadsters@autox.team.net> wrote:
>>>
>>
>> This has been discussed before, but here are the indications:
>>
>> Fuel gauge does not budge off empty
>>
>> Fuel sender resistance shows 34 ohms as installed, with tank less than half
>> full
>>
>> Fuel sender resistance when removed varies fairly linearly from 47 ohms
>> (bottom) to near zero ohms (near top), then open circuit when the arm forces
>> the wiper off the rheostat windings
>>
>> Fuel harness is delivering 7.6 volts, measured with the yellow and black
>> connectors removed
>>
>> Shorting the fuel harness to itself (yellow to black) does not change the
>> fuel gauge indication
>>
>> Ammeter works, temperature gauge works
>>
>> Ideas? Dash harness connector?
>>
>> Thanks.
>>
>> - Bob Mann, '68 2000 Solex
>>
>>
>> ________________________________________
>>
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>>
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>>
>
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