Alternator Wires - Mercedes-Benz Forum
 
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#1 (permalink) Old 11-01-2009, 10:11 AM
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Alternator Wires

My alternator belt was looser than I would like (read squeals it is so loose) when I picked up the car today.
I tried to adjust the tension but had a difficult time putting enough tension on the belts. I like the double belts, great idea actually, but what (where) is the preferred tensioning lever point for adjusting the alternator?

Also, the PO had clipped the plug from the alternator harness wires and attached three spade terminals to the wires. This poses a few problems for me. One, they are not insulated and could feasibly contact the alternator housing causing a short. I assume I will heat shrink something over them as soon as item two below is figured out...

Two, they are not differentiated so I do not know which terminal goes to which wire except that there is a small lug and two large lugs.

When I started working on the alternator the wires popped off (didn't expect that! ) and I did not know which wire was which. Educated first guess got me running again but I would like to know they are correct!

Which wire goes to which of the three terminals?
The "little" terminal is obvious, the other two are both "hot" all the time.
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#2 (permalink) Old 11-01-2009, 11:09 AM
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I posted a pic of the jump box on the 123 forum.

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#3 (permalink) Old 11-01-2009, 05:49 PM
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Yes you did, I appreciate it but it does not tell me which wire goes to which terminal at the alternator or are their positions on the alternator interchangable?
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#4 (permalink) Old 11-01-2009, 11:15 PM
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Quote:
Originally Posted by Cap'nVideo View Post
My alternator belt was looser than I would like (read squeals it is so loose) when I picked up the car today.
I tried to adjust the tension but had a difficult time putting enough tension on the belts. I like the double belts, great idea actually, but what (where) is the preferred tensioning lever point for adjusting the alternator?

Also, the PO had clipped the plug from the alternator harness wires and attached three spade terminals to the wires. This poses a few problems for me. One, they are not insulated and could feasibly contact the alternator housing causing a short. I assume I will heat shrink something over them as soon as item two below is figured out...

Two, they are not differentiated so I do not know which terminal goes to which wire except that there is a small lug and two large lugs.

When I started working on the alternator the wires popped off (didn't expect that! ) and I did not know which wire was which. Educated first guess got me running again but I would like to know they are correct!

Which wire goes to which of the three terminals?
The "little" terminal is obvious, the other two are both "hot" all the time.

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File Type: pdf 15-600 testing alternator regualtor in vehicle.pdf (147.8 KB, 89 views)
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#5 (permalink) Old 11-02-2009, 07:38 PM
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Thank you for your input Teutone.

I do not need an "Alternator Testing Procedure" PDF file.

Do you plan on providing the information I requested?

RMAC I hope you can get under the car and let me know, I truly appreciate your efforts.
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#6 (permalink) Old 11-02-2009, 08:45 PM
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Originally Posted by Cap'nVideo View Post
I do not need an "Alternator Testing Procedure" PDF file.

Do you plan on providing the information I requested?

RMAC I hope you can get under the car and let me know..
Did Rmac58 say he'd do that?. Why not crawl under your car to take photos that document your question.
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#7 (permalink) Old 11-02-2009, 09:41 PM
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Hmmmm..... I'll give some benefit of doubt that you're really not aware how your responses came across.

The two large wires are common to each other and are tied together further away going toward other systems. It doesn't matter which terminal they connect to.
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#8 (permalink) Old 11-03-2009, 05:59 AM
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Yeah, I mentioned I'd get under there, but things are piling up and haven't had a chance. He needs to know which wire goes where, as he has after market plug ends.
Yet the above post should make any further investigation moot.

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#9 (permalink) Old 11-03-2009, 11:06 AM
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Thank you Azimuth Aviation. I appreciate knowing that it does not matter which of the large ones go where, it answers my question completely.

Thank you RMAC58 for your offer but it isn't necessary to get under the car at this point.

MrBrits, I fail to see why it surprises you that one enthusiast would crawl under their car to aid another! In the MG world of enthusiasts we drive 50 or more miles to spend the afternoon working with each other's vehicles, to share talents, knowledge and muscle or to point out something that defies verbal description.

Crawling under my car and taking a picture would have served no purpose in that it would have shown three wires and three spade lugs. My question would not have changed; "The small goes on the small, which spade goes in the middle?"

The answer to which was simply "It doesn't matter."

Here are a couple of photos of the alternator as it sits. I do not like the fact that the DPO didn't put insulated connectors on , they could short to the housing of the ALT.

Thin skin never helps you on the web, or under the hood.

Alternator Wires-alternator.jpg

Alternator Wires-alternator-2.jpg
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