Denso alternator question

[b569rr]

just fired up the 493 cross ram and it runs great except that the alternator won't charge. I have a Denso unit from 440 source that I bought in 2007.

I have the single field wire hooked up correctly and it senses battery voltage 12.6.

The blue sensing wire is hooked up to my in tank fuel pump and reads 0.5 volt drop at 12.1 which is normal.

My battery red terminal is hooked up to a new #4 wire that goes directly to my battery via a resetable circuit breaker that is good to go.

The green idiot light wire is capped and I did not hook it up?

Strange it's dead with power in on the hot and sensing leads. Does the idiot light wire need to be connected?

I'm headed to napa right now to get it tested. Was hoping to go set the rings immediately. I hate shutting it down.

 

[SUPERSTOCKRACER]

Not sure about 440 source alternators, Denso style but some of them need to be grounded on the case to the frame and some need to be excited by revving up past 2500 rpm's.

 

[b569rr]

Fixed it. If spliced a wire off of the single field wire to the alternator and connected it to the idiot light wire. Charges 13.6. Thanks.

Now for my cooling issue. Car runs strong though.

 

[383man]

Many alt need the idiot lite circuit to get the field circuit to start charging and then the alt output will start supplying the field circuit and put battery volts on both sides of the idiot lite to put the lite out. But you dont have to worry about that if you dont run the alt idiot lite and just put 12 volts key on to the circuit. Ron