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| Message: | The battery is a big sink. If you remove the negative lead all the power that the alternator generates has no place to dump and can push the voltage high enough to damage the DME circuits. Yes the diodes in the regulator should short out that damaging voltage but unless you are well versed in electrical engineering why risk? Charging voltage is measured when the engine is idling or running at some reference speed say 1500 RPM. It should be 13.7VDC or above. 12.5 is too low it won't charge your battery adequately. If your regulator has not been serviced in the last 100K miles I would focus on changing that out before looking for other causes. The alternator bearings (I was told) can last 200 K miles so you can judge if that is due. Bryan do you have a 750? I just changed out the cable between alternator and the B+ post. After 17 years of cooking above the exhaust manifold the insulation has developed many cracks and this spot in the photo already shows copper corrosion (was inside the metal conduit). Corrosion like that can leak current and be responsible for low charging voltage and of course battery run down. The new cable is made from much better insulation material and I route it outside the conduit (less heat and easy inspection in the future)  Patrick C 88 750 144K | ||||
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