Alternator Fault

[thailoz]

Ok I have a 4k engine on my test stand

it has a denso alternator with an internal regulator

 

if i connect the 3 pin plug all wires double checked for correct wiring and the B post cable to Battery positive when ignition is on I get no charge lamp but when i crank the engine I get a charge light.

 

If I remove the cable from the B post light comes on with ignition

 

please help

 

thanks

[Banjo]

Hi Laurence,

Is the test stand you mention, something you have built ?

 

Does it have wiring on it that you, or someone else has fitted, with ignition switch or switches & relays of some kind ?

 

Is this the first time the stand has been used ?

 

If it has been used before, did the charge light work previously as expected.

 

I built a test stand years ago, and wired it up, and it has a charge light & it works perfectly.

 

 

If you have a wiring diagram for the test stand wiring, can you scan it, and pop it up on this thread.

 

We can then see where the error lies.

 

P.S. Does the engine run, or have you only got as far as cranking it over ?

 

Cheers Banjo

Edited April 3, 2015 by Banjo

[thailoz]

It is a test stand I have built I have just turned the engine over and it fired ok .

I took the alternator off the engine and put a multimeter from the b post to the alternator body and got continuity . I checked on an old externaly regulated alternator I have here and no continuity so I think maybe its a fault with the alternator (was bought used)

[ke70dave]

Only comment i have is to double check your engine is somehow grounded to the negative terminal of battery as i think that will have am effect on how the alternator works.

Edited April 4, 2015 by ke70dave