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Car Forum / Driving, Maintenance, Tuning / Car Audio / June 2004alternators being destroyed
what could destroy the diodes in an alternator? my sub channel in my amp kept cutting out (amp didnt go into overheat or overpower), so i replaced the amp per my installers recommendation. same behavior. he threw it on a tester, it said bad alternator diodes. i replaced the alternator, my brand new alternator comes up with the same thing. i replaced the battery as well with a yellow top. so the alternator place will send me a replacement alternator but says they won't warranty this one and something in the car must be destroying the alternator. ive never heard of anything like this, so im worried about putting a new one on. any thoughts on what i can check before i put on yet another alternator? | what could destroy the diodes in an alternator? my sub channel in my amp | kept cutting out (amp didnt go into overheat or overpower), so i replaced [quoted text clipped - 8 lines] | putting a new one on. any thoughts on what i can check before i put on yet | another alternator? Ummm... higher demand on the alternator than it is capable of producing - causing both the rectifier (diodes) circuits and the windings to overheat. fair enough, but there shouldnt be anything in the car drawing that much. this is the first amp ive put in the car, nothing else in the car is non OEM. the amp is just an xtant a4004, nothing mega, and it's never worked properly so i have to assume the damage to the alternator was done before that. so.... is there something could go wrong in an OEM setup to kill alternators? stock alternator is 90amp. the new one was dead within a couple days of installing it (ie, i didnt test the amp until it had been in the car for two days and the amp didnt work at that point). im stumped. > | what could destroy the diodes in an alternator? my sub channel in my amp > | kept cutting out (amp didnt go into overheat or overpower), so i replaced [quoted text clipped - 16 lines] > Ummm... higher demand on the alternator than it is capable of producing - > causing both the rectifier (diodes) circuits and the windings to overheat. > what could destroy the diodes in an alternator? my sub channel in my amp > kept cutting out (amp didnt go into overheat or overpower), so i replaced [quoted text clipped - 8 lines] > putting a new one on. any thoughts on what i can check before i put on yet > another alternator? It's either a really bad alternator or the diagnosis is wrong. Alternators overload all the time; it's normal. A low car battery can keep a 90A alternator at maximum output for over half an hour. Here's a test you missed - Check that the remote switch line remains at 12V. Many HU's have a resettable thermal fuse on the remote switch output. Draw too much power and it cuts out after some time. thanks, the amp isn't cutting out though (front channels always work fine, no lights come on showing overheating, or bad power conditions) and putting a meter across the sub channel terminals shows its trying to output. can an alternator test meter show bad diodes when there aren't bad diodes? i dont know anything about this type of test equipment. > It's either a really bad alternator or the diagnosis is wrong. > Alternators overload all the time; it's normal. A low car battery can [quoted text clipped - 3 lines] > 12V. Many HU's have a resettable thermal fuse on the remote switch > output. Draw too much power and it cuts out after some time. Please see Section 5 in the Car and Deep Cycle Battery FAQ on www.batteryfaq.org. Upgrading audio systems normally require an alternator upgrade as well. Kindest regards, BiLL..... > thanks, the amp isn't cutting out though (front channels always work fine, > no lights come on showing overheating, or bad power conditions) and putting [quoted text clipped - 10 lines] > > 12V. Many HU's have a resettable thermal fuse on the remote switch > > output. Draw too much power and it cuts out after some time. thanks for the pointer bill, however in this case we're talking a 90amp alternator and a small 2x50/1x200 watt amp. ive run monster 2000+ watt systems off a 90amp alternator before with a few caps (in a different vehicle). if i get motivated, i'm going to try to install the amp in the wifes car today and see what happens. > Please see Section 5 in the Car and Deep Cycle Battery FAQ on > www.batteryfaq.org. Upgrading audio systems normally require an [quoted text clipped - 18 lines] > > > 12V. Many HU's have a resettable thermal fuse on the remote switch > > > output. Draw too much power and it cuts out after some time. |
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