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RB25DET Alternator Wiring

Eric0

By Eric0,
in R Series (R30, R31, R32, R33, R34)

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Eric0

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Hello everyone! 
 

After years of driving my car, I recently decided to pay attention to my voltage gauge and saw I was only getting 12.5-13v of charge. 
 

the alternator charge stud: 14.6V

L terminal on the plug: 10.9-11.3V

Exciter wire: 10.9-11.3v

 

Whenever I disconnect the charge wire from the battery, the  voltage on the exciter wire goes to 12.5-13v and the charge wires shows 14.6v… I don’t get it. As soon as the charge wire is connected to the battery, the exciter voltage drops to 10.9ish volts. The current exciter wiring is weird, as it goes into a relay… I don’t remember why I did that. 

I’m thinking of changing the wiring to this here:

F0FBA4EC-EE6A-48EB-A626-D151C7828BDF.thumb.jpeg.64e8eb176e46af09824b1eac6daab1e0.jpeg

Would this work?


thank you,

eric 

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Eric0

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17 minutes ago, robbo_rb180 said:

I'd be using a meter set to ohms and checking resistance of the wires.
Also don't want too much voltage as well 14.2-14.3 is plenty.

Hi Robert!

Always a pleasure to hear from you.

Yes, I’ll have to set a meter to verify the voltage is around 6v. Then verify the charge is at 14.2v 

Other than figuring out the correct size resistor, is the wiring diagram correct for a functional charging system? 

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