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as the alternator turns

Old 02-06-2019, 08:12 PM
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as the alternator turns

It's been 9 months and only maybe 2k miles of "no electrical problems" since a new battery + Autozone Duralast Gold alternator + new ground cable seemingly resolved electrical issues here:

https://maxima.org/forums/4th-genera...new-one-3.html

since then all the gaskets up top have been replaced - there is NO oil on this alternator

today the battery, brake, and ABS lights came on while entering freeway Not illuminated when stopped in gear but otherwise. ABS light turned on with more revs but off back at idle. I got where I was headed and shut it off.

headed home on surface streets: i expected the battery to die en route, as all the lights were still lit when revved above idle. However halfway home - all the lights went out and did not re-illuminate.

i don't have it in me to look at voltage on the pole tonight.

what else just could be driving my electrical system problems (extraordinarily short alternator life span)? Ignition switch?

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Old 02-06-2019, 08:52 PM
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First thing on my list would be multi-meter on the post. After that I would check the ground cable. Get a dongle and download Torque. Great way to keep an eye on things like voltage while you're underway.
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Old 02-07-2019, 09:24 AM
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12.7 volts at the battery at rest

14.36 volts at Alternator pole (both at idle and revved)

14.30 volts at battery at idle

Becaus I'm stupid, I will take this car out today. I already did several stop and go cycles and couldn't reproduce the issue.

"Alternator, heal thyself"
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Old 02-07-2019, 09:54 AM
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out tha hood, on the freeway 80 mph, downshift right on time and pass at 5,500 RPM, into the work hood - no lights, no issues
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Old 02-07-2019, 09:59 AM
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^^^ well that's weird ... and disconcerting.

Intermittent, unexpected and un-telegraphed alternator failure.
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Old 02-07-2019, 08:44 PM
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Originally Posted by reallywildstuff View Post
12.7 volts at the battery at rest

14.36 volts at Alternator pole (both at idle and revved)

14.30 volts at battery at idle

Becaus I'm stupid, I will take this car out today. I already did several stop and go cycles and couldn't reproduce the issue.

"Alternator, heal thyself"
That's a great static charge. Good voltage output while running also. More evidence to bolster a ground issue theory. Now do a proper voltage drop test. Or just keep laying thine healing hand upon it. Seems to have worked

It could be as simple as corrosion on fuse contact points. I've seen that before. Never discount a short.

Last edited by User1; 02-07-2019 at 08:47 PM.
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Old 02-08-2019, 12:37 AM
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mine had a problem with the battery light illuminating bright and the brake light not so bright, was the battery terminal was bad. Once replaced, car is back to normal. Try testing that but my ABS never came on tho
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Old 02-08-2019, 12:47 AM
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Originally Posted by dbaray View Post
mine had a problem with the battery light illuminating bright and the brake light not so bright, was the battery terminal was bad. Once replaced, car is back to normal. Try testing that but my ABS never came on tho
Connections are indeed important.
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Old 02-08-2019, 12:49 AM
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Originally Posted by User1 View Post
Connections are indeed important.
true because mine was so badly corroded. Car wouldnt even try to start. It was basically make a nasty noise and start honking really low. Had no choice to replace
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Old 02-08-2019, 12:52 AM
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Originally Posted by dbaray View Post

true because mine was so badly corroded. Car wouldnt even try to start. It was basically make a nasty noise and start honking really low. Had no choice to replace
Quarterly or biannual checks will keep things like this at bay. Ensure all electrical connections are clean! Cars these days are all about electrical and computer systems.
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Old 02-08-2019, 12:54 AM
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Originally Posted by User1 View Post
Quarterly or biannual checks will keep things like this at bay. Ensure all electrical connections are clean! Cars these days are all about electrical and computer systems.
Yup i do. I put that cleaner stuff. But something tells me ill need to replace the negative terminal soon because it looks kind of bad. Oh well hasnt given me problems yet.
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Old 02-08-2019, 12:58 AM
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Originally Posted by User1 View Post
Quarterly or biannual checks will keep things like this at bay. Ensure all electrical connections are clean! Cars these days are all about electrical and computer systems.

This is what i was talking about. Just driving and u see the battery light on and brake light. This was a bad alternator
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Old 02-08-2019, 01:04 AM
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Originally Posted by dbaray View Post


This is what i was talking about. Just driving and u see the battery light on and brake light. This was a bad alternator
How did you get a definitive diagnosis for the alternator?

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Old 02-08-2019, 01:07 AM
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Originally Posted by User1 View Post
How did you get a definitive diagnosis for the alternator?
it was many things that were old in the car lol. We first changed the battery. Car still wouldnt start right. The starter was also old because of all the years of driving. Then those lights came on like i showed and that was the alternator. Ha then the battery cable and then the ignition switch
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Old 02-08-2019, 01:08 AM
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Originally Posted by User1 View Post
How did you get a definitive diagnosis for the alternator?
but to answer your question the alternator was low on charge thus causing those lights to come on. Battery and starter were brand new so that was the only option.
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Old 02-08-2019, 01:08 AM
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Originally Posted by dbaray View Post

it was many things that were old in the car lol. We first changed the battery. Car still wouldnt start right. The starter was also old because of all the years of driving. Then those lights came on like i showed and that was the alternator. Ha then the battery cable and then the ignition switch
Alright well sounds like you should get a few more miles out of it now!
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Old 02-08-2019, 01:10 AM
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Originally Posted by dbaray View Post

but to answer your question the alternator was low on charge thus causing those lights to come on. Battery and starter were brand new so that was the only option.
By process of deduction!
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Old 02-08-2019, 01:10 AM
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Originally Posted by User1 View Post
How did you get a definitive diagnosis for the alternator?
Originally Posted by User1 View Post
Alright well sounds like you should get a few more miles out of it now!
yes still trucking! Haha but donít let it get to that point. None of that really would of happened had it gotten regular maintenance so we were stuck with all those problems. Ha it left me stranded once cause it wouldnt start
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Old 02-08-2019, 01:11 AM
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Originally Posted by User1 View Post
By process of deduction!
yes a very pricey one!
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Old 02-08-2019, 10:42 AM
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this is day two for me post-lights going away. still no issues.

my negative ground cable is "new" and is torqued down to spec both under the battery and at the block.

this lifetime Houston, TX car doesn't have any corrosion issues like I hear Yankee examples sometimes do

i have not been poking around at any electrics in the recent- or even not-so recent-past

I don't know where an intermittent ground fault could be coming from except...ignition switch
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Old 02-08-2019, 11:06 AM
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Originally Posted by reallywildstuff View Post
this is day two for me post-lights going away. still no issues.

my negative ground cable is "new" and is torqued down to spec both under the battery and at the block.

this lifetime Houston, TX car doesn't have any corrosion issues like I hear Yankee examples sometimes do

i have not been poking around at any electrics in the recent- or even not-so recent-past

I don't know where an intermittent ground fault could be coming from except...ignition switch
you can tell if you have a bad ignition switch. When you turn the key it wont crank or start for sometimes once or a few times. Then it will start like on the next try.
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Old 02-08-2019, 01:17 PM
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Did you clean all the grounds, including the one under the battery tray and the one going to the block?
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Old 02-08-2019, 02:08 PM
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Originally Posted by DBear View Post
Did you clean all the grounds, including the one under the battery tray and the one going to the block?
Originally Posted by reallywildstuff View Post
my negative ground cable is "new" and is torqued down to spec both under the battery and at the block.
Where else to check? Thanks.

BrianA

Last edited by reallywildstuff; 02-08-2019 at 09:20 PM. Reason: un-helpful, sorry
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Old 02-08-2019, 08:14 PM
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Nice! Sounds like you nailed it! Should last you a while now! Have you notice it run and/or shift any better/smoother since you did the work?
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