Alternator bench test

Submitted: Monday, Jul 19, 2004 at 13:01
ThreadID: 14797 Views:4953 Replies:4 FollowUps:8
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Here is one for the auto sparkie. I have 55A alternator (Ford) set up on the bench and running of the electrical motor. It was working on the car, but so far i am unable to get it running on the bench. It has 2 B+ terminals and 2 blade plug. Does anyone know how to wire it up properly. I am only getting 2V at the moment (tester + on B+ and - on the anternator body. Appreciate any imput from forum members.
Thanks
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Reply By: Utemad - Monday, Jul 19, 2004 at 15:08

Monday, Jul 19, 2004 at 15:08
You haven't said how you currently have it wired up.

Utemad
AnswerID: 68442

Follow Up By: Goran - Monday, Jul 19, 2004 at 16:16

Monday, Jul 19, 2004 at 16:16
I have positive of the tester going to +B main terminal, and negative of the tester to alternator body.
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Follow Up By: Utemad - Monday, Jul 19, 2004 at 16:30

Monday, Jul 19, 2004 at 16:30
Well you need to have a +ve control wire going to the alternator. This wire feeds the internal regulator. Unless it does not have an internal regulator in which case you will need an external one. Also connect the case to earth.

This will get it going so long as you can see which terminals to put the wires on to. I am no expert when it comes to exactly what the terminals are but if you take the alternator to your local auto sparky he should be able to just tell you which connector is for what. Some are pretty obvious but others can be a real pain.

Utemad
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Reply By: AT4WD ADVENTURES - Monday, Jul 19, 2004 at 16:52

Monday, Jul 19, 2004 at 16:52
Goran,

You need to excite the field of the alternator to get a result. Post your email address and I will send you a DIY document.

Regards

Stuart
AnswerID: 68454

Follow Up By: Goran - Monday, Jul 19, 2004 at 17:37

Monday, Jul 19, 2004 at 17:37
majaciem3@yahoo.com.au
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Follow Up By: Bonz (Vic) - Monday, Jul 19, 2004 at 17:50

Monday, Jul 19, 2004 at 17:50
yer do me too gandrATdatafastDOTnetDOTau, thanx
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Follow Up By: wilko65 - Monday, Jul 19, 2004 at 17:54

Monday, Jul 19, 2004 at 17:54
Is the alternator a bosch ? If it is and the 2 terminals you are talking about make a T, then it is an external regulator alternator. The top of the "T" is a D+ terminal and can be connected to the bottom of the "T", Which is called the F terminal. F can be joined to the B+ also, but connecting both together checks the exciter diodes for correct operation. It will not start to charge until about 3000 rpm give or take. If it does not excite at all, connect B+ to F and it should. These 2 wires normally go to the external regulator. By connecting it as above you have bridged out the regulator and the alternator will charge full current.
You would only run it like this a few minutes due to the heat generated. P = V X I, = 12volt time 50 amps = 600 watts.
If all else fails, take it to your friendly auto lecky. He has spent a whole life time explaining the above to customers.
Good luck.
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Reply By: AT4WD ADVENTURES - Monday, Jul 19, 2004 at 17:50

Monday, Jul 19, 2004 at 17:50
Its winging its way to you now via email. Any more info let me know.

Stuart
AnswerID: 68463

Follow Up By: Goran - Monday, Jul 19, 2004 at 19:20

Monday, Jul 19, 2004 at 19:20
Thanks to all of you.
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Follow Up By: Goran - Monday, Jul 19, 2004 at 21:59

Monday, Jul 19, 2004 at 21:59
Stuart nothing came yet. Can i trouble you again, try sending to
majaci@westnet.com.au
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Follow Up By: AT4WD ADVENTURES - Tuesday, Jul 20, 2004 at 08:44

Tuesday, Jul 20, 2004 at 08:44
Guys,

I have sent again to all of you.
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Reply By: V8troopie - Tuesday, Jul 20, 2004 at 00:12

Tuesday, Jul 20, 2004 at 00:12
Goran, what are you trying to test? I assume you HAVE connected it to a battery. You'll get nothing out of an alternator unless you feed in some field current first. I would imagine the 2 blade plug being the field connection ( they should go to the brushes inside). You can regulate the output manually by varying the current to the field (the regulator's job).
Oh, and DON'T run it without a battery connected to the B+ as well or you might fry the diodes inside.
Klaus
AnswerID: 68543

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