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Check your body to engine and negative battery ground connections. Bad electrical connections do all sorts of weird things in automotive circuits. My father, the electrical engineer, always claimed automotive electrical systems shouldn't work!
A bad ground will cause "positive" voltage to appear in all sorts of strange places. I had a bad headlight ground on the Volvo, and none of the turn signals would work, the key buzzer stayed on all the time, and other weird stuff.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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