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Re: Voltage Regulator Problem

To: Carl Mole <C.Mole@tees.ac.uk>
Subject: Re: Voltage Regulator Problem
From: Paul Hunt <paul.hunt1@virgin.net>
Date: Sat, 28 Mar 1998 16:58:37 +0000
Carl Mole wrote:
> 
> 1978 MGB GT
> 
> The problem was that the fuel gauge was not working at all
> , temperature gauge erratic.
> 
> Replaced the Voltage regulator , now the fuel gauge only
> registers half way (fuel tank full) temperature gauge works
> fine.
> But remove regulator from bulkhead (not earthed) and fuel
> gauge works fine , temperature gauge goes into the red!
> 
> I've followed the installation instructions to the letter
> for the regulator - terminals uppermost and no more that 20
> degrees from the vertical!!! (is this relevent - I've tried
> turning it around with the same results).

Carl - sounds like the regulator is OK judging by the results observed with it 
unscrewed from the bulkhead (it is this physical connection that gives it the 
ground required to produce the 'regulated' voltage, without it it produces the 
full 12v at the output.  Have you changed your tank or sender recently?  It is 
not unusual to get this problem if you have.  Fortunately, and in any case, the 
gauge is adjustable.  Look on the back and you should see two holes in the case 
beside the terminal posts - they may be covered by a cork disc.  In the hole 
you 
should find a slot.  Put a good-fitting screwdriver in the slot and twist to 
adjust the full (slot nearest 'full' end of gauge) and empty as desired.  Make 
sure the screwdriver is a good fit, on two gauges I tried the thing you are 
twisting was very stiff, a poor fitting screwdriver could round-out the slot.

PaulH.


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