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Alternator will not produce current

Hi there,

I am trying to use a 10 S1 series Delcotron alternator, that is one of several spares for my 1970 Corvette, collected when I had access to a breakers yard. I have made all the mounting plates, pulley wiring etc. to connect one to a diesel engine for a home generator. I have a manual and lots of spares, but I just cannot get the thing to energise and produce a charge for the battery.

There are several things that spring to mind. The engine is only running at about 1000 rpm which according to the size of the belt pullies, should be producing at least 2000 at the alternator. I have connected the battery + directly to the main output and a link goes to the no. 2 terminal on the regulator. The no. 1 terminal goes to the

+12v through a bulb and switch. The bulb does not go off at all.

Trying to short the earthy side of the slip ring to frame as suggested by the book, by poking a screwdriver into the hole at the back of the frame does not change the battery voltage at all. It is about 12.7 volts after starting the engine. This would seem to put the blame on the rotor, the stator, the diode trio or the rectifier block, or some thing else. As I have a lot of spare alternators of this type I have been substituting varoius bits to try and find out why it will not energise.

I have tested all the rectifier blocks, diodes, stators and rotors with various meters and they all seem OK. I am sure the insultators on the fixing screws are in the correct positions, all connections vare clean, the resistance between two fixing screws on the brush holder/regulator is about 40 ohms. But it will not go! The earth cable goes to all the right places.

There must be something simple wrong that I am missing. I have had this arrangement on many other US cars of that era and they all seemed to charge OK on a fast tickover. Being on my own I must not be able to see something. Has anyone got any ideas. Please.

Regards George.

Reply to
George
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Reply to
Dad

Hi there Dad.

It tells me " You don't have permission to access / on this server."

Do you know any way to test the regulators with an ohm-meter. Even though I do not think this is the problem in this case, I have lots of un - proven regulator blocks, what readings can be expected at the various terminals? My next step today will be to leave out the regulator and try and feed in external excitation control to the rotor slip ring, - even an unregulated preset current would be OK in this case. However the symptoms point to a power problem, or is it simply not going round fast enough?

Regards George.

Reply to
George

Not sure how I can help you, that site has wiring diagrams for setting up home generators. Plus it gives you a smaller "A" style commercial pulley to use. What country are you posting from?

Reply to
Dad

.

Today I got diverted by less interesting chores, but I am in UK. Not a particularly risky location, I would have thought.

I just tried again and got the same error 403 message. You must be thinking it is not reaching excitation speed though, from your comments. Perhaps I shall bolt it down and wind it up a bit more. It is not bolted down at present and this is why I don't want to rev it over fast tickover. It starts to walk about.

Regards George.

Reply to
George

Today I got diverted by less interesting chores, but I am in UK. Not a particularly risky location, I would have thought.

I just tried again and got the same error 403 message. You must be thinking it is not reaching excitation speed though, from your comments. Perhaps I shall bolt it down and wind it up a bit more. It is not bolted down at present and this is why I don't want to rev it over fast tickover. It starts to walk about.

Regards George.

We're still just a bit leery of the English, they came over here and taught us to kill indians once. Worked around Chorley and Wigan for a few months, people seemed almost civilized. ;-))

Not thinking speed is the problem/issue but saw that it had been by the presence of the smaller pulley on the site. Yes, it's a sort of a survival site so it may have drawn so censure.

Sent you a diagram by email, may help.

Reply to
Dad

Today I got diverted by less interesting chores, but I am in UK. Not a particularly risky location, I would have thought.

I just tried again and got the same error 403 message. You must be thinking it is not reaching excitation speed though, from your comments. Perhaps I shall bolt it down and wind it up a bit more. It is not bolted down at present and this is why I don't want to rev it over fast tickover. It starts to walk about.

Regards George.

Sometime to excite a alt you have to rev them high briefly.

Reply to
Roy

Site just worked fine here in the states. Are the brownshirts starting to ban reading material in Europe again?

-W

Reply to
Clams Canino

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