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Re: Alternator Grounding
[Re: jeebis44]
#1425043
04/24/13 08:39 PM
04/24/13 08:39 PM
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Joined: Nov 2007
Posts: 21,930
Kirkland, Washington
Pacnorthcuda
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Kirkland, Washington
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Quote:
Do I just need to ground the casing? Or is there something inside that needs to be grounded? [/quote
I would be willing to bet its just a case ground. The way to check? SIMPLE! Just put a continuity or ohmmeter on the stud and case and check for continuity!
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Re: Alternator Grounding
[Re: jeebis44]
#1425044
04/24/13 09:36 PM
04/24/13 09:36 PM
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Joined: Jul 2007
Posts: 1,526
North Carolina
cjskotni
pro stock
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pro stock
Joined: Jul 2007
Posts: 1,526
North Carolina
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The stud is simply a stud screwed into the casing. Normally, the bolt that holds the alternator to the brackets would be sufficient to ground but running a jumper wire from that ground stud to a bolt on the engine block wouldn't hurt. Don't overthink it. It's just an additional point where you can ground from. That's it. Not a bad idea to use it to make sure your grounds are 110% but not absolutely needed. 
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Re: Alternator Grounding
[Re: cjskotni]
#1425046
04/24/13 10:26 PM
04/24/13 10:26 PM
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Joined: Jan 2003
Posts: 18,434
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NITROUSN
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Quote:
The stud is simply a stud screwed into the casing. Normally, the bolt that holds the alternator to the brackets would be sufficient to ground but running a jumper wire from that ground stud to a bolt on the engine block wouldn't hurt.
Don't overthink it. It's just an additional point where you can ground from. That's it.
Not a bad idea to use it to make sure your grounds are 110% but not absolutely needed.
That is wrong. That alternator needs a hd ground. It has rubber isolators for mounts thats why there was a wire when the car was built.
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Re: Alternator Grounding
[Re: jeebis44]
#1425047
04/24/13 10:30 PM
04/24/13 10:30 PM
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Joined: Nov 2007
Posts: 21,930
Kirkland, Washington
Pacnorthcuda
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Quote:
Thanks for the replies. So then, I should be able to check for continuity between the case and the engine block and if it's there, I'm good?
Yes, correct. Just as long as there is a good reliable metal to metal connection.
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Re: Alternator Grounding
[Re: jeebis44]
#1425048
04/24/13 10:30 PM
04/24/13 10:30 PM
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Joined: Jan 2003
Posts: 18,434
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NITROUSN
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Quote:
Thanks for the replies. So then, I should be able to check for continuity between the case and the engine block and if it's there, I'm good?
No.. You want to use a heavy guage wire from that stud to the engine. All the factory cars and trucks had a ground wire. You alternator is mounted with rubber isolators thats why there was a HD wire on the car. I would ask for another correct alternator.
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Re: Alternator Grounding
[Re: NITROUSN]
#1425049
04/24/13 10:35 PM
04/24/13 10:35 PM
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Joined: Nov 2007
Posts: 21,930
Kirkland, Washington
Pacnorthcuda
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Kirkland, Washington
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Quote:
Quote:
Thanks for the replies. So then, I should be able to check for continuity between the case and the engine block and if it's there, I'm good?
No.. You want to use a heavy guage wire from that stud to the engine. All the factory cars and trucks had a ground wire. You alternator is mounted with rubber isolators thats why there was a HD wire on the car. I would ask for another correct alternator.
"That stud" represents nothing more that an electrical connection to the case. As long as the the alternator is NOT isolated (electrically) he's fine. I did not read they the posts carefully, but I thought he is using this alt in a non stock application. I could be wrong.
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Re: Alternator Grounding
[Re: Pacnorthcuda]
#1425051
04/24/13 10:41 PM
04/24/13 10:41 PM
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Joined: Jan 2003
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NITROUSN
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Quote:
That stud" represents nothing more that an electrical connection to the case. As long as the the alternator is NOT isolated (electrically) he's fine. I did not read they the posts carefully, but I thought he is using this alt in a non stock application. I could be wrong.
You are very wrong. His whole post is full of mis-information. That alternator is rubber isolated mounting. Look at the rubber mounts. The stud is there for a reason. That unit is very power full and needs a correct ground. Why do you think the factory used it and had about a 10 or 8 gauge wire on it??? Come on you guys smarten up.
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Re: Alternator Grounding
[Re: Pacnorthcuda]
#1425052
04/24/13 10:44 PM
04/24/13 10:44 PM
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Joined: Jan 2003
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Quote:
Now I see. The alts mounting bosses are isolated. All that would be required would be to reliably defeat this isolation. That could be by using the ground stud as designed, or by defeating the isolation itself.
You don't want to eliminate the mounts. They help make the alternator last longer, run cooler and from what I remember cut down on RFI as they were mainly used in police and taxi.
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Re: Alternator Grounding
[Re: NITROUSN]
#1425053
04/24/13 10:53 PM
04/24/13 10:53 PM
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Joined: Nov 2007
Posts: 21,930
Kirkland, Washington
Pacnorthcuda
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Quote:
Quote:
Now I see. The alts mounting bosses are isolated. All that would be required would be to reliably defeat this isolation. That could be by using the ground stud as designed, or by defeating the isolation itself.
You don't want to eliminate the mounts. They help make the alternator last longer, run cooler and from what I remember cut down on RFI as they were mainly used in police and taxi.
So the millions of alternators that are solidly and electrically mounted are doomed? Not saying you're wrong, just saying you're being extreme. In The typical moparts fashion. Lighten up.
If the OP doesn't want to do add any wiring, fine....if he doesn't care then do it!
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Re: Alternator Grounding
[Re: Pacnorthcuda]
#1425054
04/24/13 11:03 PM
04/24/13 11:03 PM
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Joined: Jan 2003
Posts: 18,434
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Quote:
So the millions of alternators that are solidly and electrically mounted are doomed? Not saying you're wrong, just saying you're being extreme. I. The typically moparts fashion. Lighten up.
If the OP doesn't want to do add any wiring, fine....if he doesn't care then do it!
No they are not doomed. The problem here is you gave incorrect advice on a designed system that you clearly know nothing about. You should admit the incorrect advice and take a back seat and learn something.
He needs to correctly ground that alternator. If not what that unit gets full fielded it will look for a ground and burn up what ever it can trying to find it. The op even states it was grounded by that stud to the head by a wire. Do it right and he wont have issues.
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Re: Alternator Grounding
[Re: ahy]
#1425056
04/24/13 11:05 PM
04/24/13 11:05 PM
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Quote:
I run the "big Chrysler" alternator also. As posted, the alternator mounts are rubber isolated - unlike the typical round back or square back. The big alternator needs a heavy ground from the case to to engine head or block to function correctly. Good sized block to chassis grounds are needed also. The OE ground on my donor vehicle looked like 6 gauge so that's what I used. Same size for the power wire (+).
Finally someone else that can tell it like it should be.
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Re: Alternator Grounding
[Re: NITROUSN]
#1425058
04/24/13 11:08 PM
04/24/13 11:08 PM
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Joined: Nov 2007
Posts: 21,930
Kirkland, Washington
Pacnorthcuda
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Quote:
Quote:
So the millions of alternators that are solidly and electrically mounted are doomed? Not saying you're wrong, just saying you're being extreme. I. The typically moparts fashion. Lighten up.
If the OP doesn't want to do add any wiring, fine....if he doesn't care then do it!
No they are not doomed. The problem here is you gave incorrect advice on a designed system that you clearly know nothing about. You should admit the incorrect advice and take a back seat and learn something.
He needs to correctly ground that alternator. If not what that unit gets full fielded it will look for a ground and burn up what ever it can trying to find it. The op even states it was grounded by that stud to the head by a wire. Do it right and he wont have issues.
Please show me where I advised that it does not need to be reliably grounded? Clearly the ground stud is to facilitate isolation.
Again...lighten up. Stay grounded. 
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