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Blew 2 alternators in two weeks charge light came on less then 12 hours after install

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Blew 2 alternators in two weeks charge light came on less then 12 hours after install

Old 04-20-2017, 12:53 PM
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Red face

If after all this Did we ever check for a shorted Diode ??

I might have missed it.

A shorted diode will for sure take out the 80 amp protection

Do you see Arc marks where the B terminal connection might have shorted
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Old 04-20-2017, 05:57 PM
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Originally Posted by wyoming9 View Post
If after all this Did we ever check for a shorted Diode ??

I might have missed it.

A shorted diode will for sure take out the 80 amp protection

Do you see Arc marks where the B terminal connection might have shorted
That alternator in the picture is a different alternator then the one that blew up my fusible link. I did see the arc marks on this alternator and am in the process of replacing the alternator boot..

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Old 05-09-2019, 09:25 PM
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Looks like I never told you all what ended up happening. I finally decided it was a bad alternator and returned it to Oreily's and they put it on the testing machine and could not even get the machine to read the alternator to test it. I installed a "new" alternator and have been running it for about two years now. They sold me a bad part that blew my main fuse-able link...

I've said it before, just because it's "new" or "rebuilt" out of the box doesn't mean it is not the problem!

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Old 05-10-2019, 02:33 AM
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It's a long thread I didn't read entirely:

If you buy those remanned alts - always buy 3. Or 4. Maybe one will work - and one might work longer than a year.


ps: Diode short will make it "groan" and work hard, but it does not take out the fusible link if you stay under 60 seconds. It's an obvious bug. :p

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Old 05-15-2019, 04:31 PM
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The alternator had a dead short in it. Something you don't think of testing for on a "new alternator." At least a person shouldn't have to anyway...

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Old 05-15-2019, 05:25 PM
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Before you dump TOO much on O'Reilly's (or the reman. they purchase from), consider the class of customer almost all "auto parts" stores get. A few of them (most of them?) are folks like you and me, But they get a fair number who will pull out their dead alternator, clean it up as best they can, and put it back into the box of the reman alternator they just purchased. Then it's back to the store to "return" the alternator "they didn't need." You're the initial victim of that behavior, but you got a replacement alternator for no extra charge, and in the end O'Reilly's had to eat it.

I wish parts stores had some way to catch this. But until they can, it's the most likely source of "dead on arrival" parts sold to folks like you and me.
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Old 05-15-2019, 10:46 PM
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Neither alternator was DOA, the first one ran for about a year. The second one installed nicely worked fine for less than a half a day... and when it went, it blew my main 80 amp fuse/fusible-link. When it blew I figured it was my electrical system since the "new/reman" alternator blew in 12 hours... When I had replaced my 80 fusible link and tested everything, I was hooking up the battery (negative cable) and POP!!! Big sparks and another blown 80 amp fuse... After 3 days of testing and finding nothing wrong I took the new bad alternator back to Oreily. When they put it on their testing machine the machine went haywire and would not work at all. They gave me a new alternator and I put it in the truck and all has been well for two years...

I think this was a weak reman that gave out and I happened to be the unfortunate soul that got it... Boy did I get it! lol...
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Old 05-16-2019, 01:16 PM
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For critical parts, especially those I i expect to last 10 years or so, I buy OEM - even remanufactures - with Toyota warranty. Saves me time.
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