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Re: [Mgs] the voltage stabilizer dilemma

To: MG List <mgs@autox.team.net>
Subject: Re: [Mgs] the voltage stabilizer dilemma
From: Max Heim <mvheim@sonic.net>
Date: Wed, 21 Nov 2012 13:35:59 -0800
Delivered-to: mharc@autox.team.net
Delivered-to: mgs@autox.team.net
Thread-index: Ac3IJZVFZvN8gJoXRHmpnqTTlb+k8gACpzzl
Thread-topic: [Mgs] the voltage stabilizer dilemma
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I'm trying to recall, is there supposed to be a grounding strap to the fuel
tank?

--

Max Heim
'66 MGB GHN3L76149
If you're near Menlo Park, CA,
it's the primer red one with chrome wires



on 11/21/12 12:42 PM, Councill, David at dcouncill@msubillings.edu wrote:

> Another warm day today so I drove the 72B to work today. It does have an
> interesting problem of which I need to provide a bit of history. I had a body
> shop restore and paint a 72 body shell (a parts car I bought about 10 years
> ago), and I transplanted the drivetrain (engine, transmission, rear axle) from
> my rusted out 71BGT in to it. After I got it running, I noticed that the
> engine appeared to overheat (on the gauge) which turned out to be an
> improperly grounded voltage regulator. I fixed that problem but the fuel gauge
> always tended to read low. In particular, a full tank always starts about 1/8"
> below full and drops to > after 10-20 miles and then = tank after about 80
> miles. I know I can recalibrate the gauge but it was just an annoyance so I
> put it off. The coolant temperature gauge also probably ran low as it always
> ran a little below the halfway mark, below "N" but nothing unusual there.
> 
> Then a few months ago, I noticed that the coolant temperature was running a
> bit cooler, about halfway between C and N, so I bought a thermostat which I
> still haven't got around to replacing. Maybe that was a good thing because the
> last month or so when driving, I noticed that sometimes the coolant gauge
> would actually drop to almost "C" and the fuel gauge would like wise drop,
> only to return back to more normal readings minutes later. With both in
> tandem, I figured it had to be the voltage stabilizer. And at a cost of around
> $11, I bought a new one from Moss and installed it.
> 
> Yesterday, with an almost full tank of gas (6 miles less than full and the
> gauge at its usual full position about an 1/8" shy of F), the problem
> reappeared. I was driving, glanced at the coolant temperature and it was down
> to almost "C" and the full tank read a mere half tank on the fuel gauge. A
> mile or so later, it was back to normal. So it doesn't look like the
> stabilizer unless I coincidentally have two bad ones (not likely but not
> impossible). Things are normal this morning but this evening will be a drive
> in the dark if that is relevant. I should throw in the fact that during the
> restoration (~8-10 years ago), I replaced the wiring harness with a new one
> and the instrument gauges are grounded with the black ground wire from the
> harness.
> 
> So I am not sure the next step to figure out this annoyance. But I figure
> since the list isn't seeing much traffic right now, this will make a timely
> inquiry and save us from someone posting on whether the list is up or not :)
> 
> David Councill
> 64 B
> 67 BGT
> 72 B
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