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Im very familiar with EMI, thats part of being a real auto technician.

So the best you can come up with is that these are robust and are resilliant to the voltage??

Yup! what do you want, SEM photos of the die? I dont have it. you have to trust me on this

Sure, if you have them! and I never trust anyone because they say so.

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Phone that alternator rebuilder I mentioned earlier, and let him tell you how robust they are! A simple sulphated battery can cause the the rectifier to fail. Rectifiers fail because of heat, so alot depends on the heat dissipation capabilities of the alternator, where its mounted in the car, the load placed on it etc....


Yes, sulphanted battery causes the alt to put out higher voltage and current and the diode overheats and dies. Thats what I said kills diodes- HEAT


yes heat kills them. Ive said that a while ago, step into today! also exceeding their capabilities will kill them.

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very good, but is it still advisable to disconnect the battery with the engine running???


on a 70's car with 70's electronics (which is what I have been saying all along), it can be done. yes

In the beginning of this discussion did anybody ask the owner to ID all of his electrical components?? Did anyone go do an inventory on his vehicle? And maybe he has an aftermarket regulator thats most lilkely been replaced since 3 decades have passed?

Is this something we need to do before we heedlessly determine if the car will survive the voltage increase that you fail to realize exists??

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what about your aftermarket stereo, your electronic autometer tach, or your replacement mechanical voltage regulator with the electronic internals?? anyone have an MSD? or some type of spark amplifier?


Change the situation and I'll change the answer. These are modern electronics. more susceptible but I doubt they would be harmed because I dont believe you'll see an increase in current or voltage by disconnecting the battery

If you trust me, I might trust you! But I assure you, youre wrong, and if you were exposed to the autmotive world you would have conquered this inability to see how this really works.

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just how robust are the Chryco electronic regulators?? or ignition boxes?? Maybe you can test one???? And issue us safe limits with a mil spec on them??


Want specs? I'll get them. theyre at my house

Specs are good! maybe we can ascertain how well they will survive given the circumstances, then again, we could just use a proper diagnostic method which would eliminate all this typing and arguing. WHY CONTINUE ?? How can any logical human being state that its logical to disconnect the battery knowing what we know??

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how many of peoples cars have no up to date electronics in them??? Or an alternator??!!! and what makes you so sure the old chryco ones can take it??? and if so, why would you subject them to that abuse???


Youre saying you get 400v when I disconnect the alternator. I say your nuts. You say I'll blow all my circuits. I say Ive done it many time before and Ive never had that happen.

Pay attention , I said 200 was more likely. I never said 400. That was stated by a gentleman that went to chyco electrical school (im sure they teach all the wrong stuff) I dont say you WILL blow all your circuits, you said that (lawyer?) I said youll be likely or at least succeptible to it, and did not mention all. I said anything with an IC is succeptible and also the rectifier in the alternator. Ive got enough words in my mouth without you adding your own. You may never have anything bad happen by having unprotected "relations" but that does not make you immune. Ive said that before enough times, go read them.

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get a voltmeter for $9.99!!


My voltmeters (I have several)cost several hundred dollars. I dont use cheap tools

good for you, I too own a labscope and a graphing multimeter and other expensive tools. It still wont save you from disconnecting the battery with the car running like a moron. A simple $9.99 voltmeter is enough to diagnose if the vehicle's alternator is at least trying to charge the battery. This is much safer, reliable, and practical. Surely anyone can see that.

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is it still ok to disconnect it???



yes

ya, go right ahead. A little knowledge is dangerous. Maybe you get lucky 999 times out of 1000, good for you, but that still does not make it right. and again, only a moron would do it and subject himself to future problems. Totally unprofessional and if anyone did it, anyone of the automotive technicians I know would laught themselves silly at them







The sad thing in this all, is that I'm just an auto mechanic, not an engineer. Ive had the opportunity to pursue an career in engineering , but chose not to. I strongly suggest you contact another engineer in the automotive field and you guys can talk in your secret lingo and Im sure he'll inform you of your mistakes.