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Usually I do a visual on the balancer. Look to see if there are magnet pieces or whats left of the stator laying around the front of the engine. If the balancer is bad, it usually takes the stator out, if the stator shorts, it fries the regulator. Its been a while since I worked on one, but it used to be $200 per item(balancer, stator, regulator). If its just the regulator, get the CDI brand.