Back onto the subject of hot cars (rather than hot weather)...
Spitfires have a Voltage Stabiliser which takes the rather variable voltage
at the battery/alternator/generator and outputs a fixed 10V to supply the
gauges. If this dies then it will output the full 12-14V and the gauges
will read correspondingly high.
How's your fuel gauge accuracy? If this is reading over-full when you are
full then this will confirm voltage regulator problems.
You will need a needle voltmeter to test this. The device works by
switching rapidly between full voltage and 0V to give a 10V average - a
needle voltmeter will show this average, but a digital voltmeter will just
give random numbers jumping all over the place.
On a 1500 the voltage regulator is retained under one of the speedo mounting
screws. Don't know where you'd find it on a Spitfire4.
Richard & Daffy
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