It looks like Bob wins the prize.
The long description:
There are 2 test points internal to the fuel gauge on the back side.
They are covered with tiny little cork gasket inserts that look as if
they were punched with a standard hole punch. One of these inserts had
crumbled a bit and worked its way inside the gauge. This tipped the
internal workings such that a rivot on the workings was shorting to the
gauge body.
It at least works on the bench now (by works, I mean there is no longer
continuity between the poles and the body of the gauge.)
Bob Nogueira wrote:
> Mark
> My guess is the short is on the back of the fuel gauge and it is the post
> that is grounding
> (the post accepting the wire from the stabilizer) . The wires inside the
> gauge are so fine that a short internally would burn up the internal wire
> long before you would blow a fuse. It's not in the wire to the sending unit
> or the sending unit as there is a load within the gauge and a short would
> result only in the needle pegging.
> Good luck and let us know what you find.
>
> Bob Nogueira
>
> - Original Message -----
> From: "Mark Steph" <tr6@pobox.com>
> To: "Bob Nogueira" <nogera@worldnet.att.net>
> Cc: <british-cars@autox.team.net>
> Sent: Sunday, August 10, 2003 9:44 PM
> Subject: Re: is this the voltage stabilizer?
>
>
>
>>Ok, that makes sense.
>>
>>So since I have stocked up on fuses (I am getting used to this by now...)
>>
>>1. turn fan on (indication of when fuse goes)
>>2. connect I & B Lucar connectors (from volt. stab.) together. Fuse
>
> blows.
>
>>3. replace fuse
>>4. disconnect both temp and fuel
>>5. connect I & B. nothing happens.
>>6. connect temp gauge only, connect I & B. Nothing happens. (Engine
>>is cold, so nothing registering is normal here.)
>>7. connect fuel gauge only, connect I & B. Fuse blows.
>>
>>Ok, this leads me to believe I have a short somewhere either between the
>>stabilizer output and the fuel gauge or between the fuel gauge and the
>>sender unit. Or possibly the terminals on the gauge are somehow
>>grounding to the gauge itself.
>>
>>I will dig further tomorrow evening.
>>
>
> snip-------------------------------------
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