Quote:
Originally Posted by Stevef99
Hi la1,
It is a NEW and CURRENT problem for me. Some time back my previous alternator failed. When I took it apart, I saw that one of the diodes was dud. It looked like the entire rectifier assembly had been overheating, but I put that down to the shorted diode. My car is a 1979 V12 Jaguar. I replaced the faulty rectifier, and changed the voltage regulator. But the symptom that I described had not gone away. I dismantled the alternator again, and concluded that there may be shorted turns in one of the stator windings. I could not source a replacement stator coil, (NLA), so I had to fit a replacement alternator (later design, as original pattern alternator was obsolete)
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what you need to do is measure the alternator output current. this is done with a meter attachment that clamps around the wire output of the alternator. see how much current it is producing. see if the amount of current is to high. most operate at 60% at the rated alternator current spec, with a 130 AMP and engine running have all power assy OFF. should be 50-70amps.then put on one assy at a time see if the current surges. if this is a 79 JAG this is a wiring mess. I do not like these vehicles electrical systems very poorly designed.... you could have a short circuit in the door that feeds the window motor as an example .........................