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Electrical gurus:Does a 90 740 GL has a battery temp sensor controlling the voltage regulator? 700 1990

Found that ,with a ebayed obtained Volvo voltmeter gauge in dash/cluster which worked perfectly all winter,the volt gauge reading would be lower when the engine compartment is hot,like in a hot day while idling in traffic jam,is this normal.? is this to prevent the battery from frying in a hot car ?Thanks fior advice
Tom
Without the volt gauge add on,would not have noticed this!






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