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i will take a stab. if it was my car i would hook up my 4 channel lab scope and monitor the batt,alt and ballast supply voltage and i would look for spikes while running . i would mainly look at alt and if pushed for a guess.....voltage regulator....if they are like the old bosch they are held on to the rear of the alt by 2 screws. like any electrical problem start at the source..the batt...is it old,low on water,connections tight etc ?
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