Delco 3 wire help needed

[Karl Spiteri]

Hello if anyone can help will be much appreciated took one of my àlternators for reconditioning and the electrician changed the brush holder regulator and bearings since then I am having problems with the rev counter if I switch the other engine off it works ok but with the other engine on I have the rev counter playing around can it be that the old regulator had a diode thanks

Topic

[Tony Athens]

That would do it!

[Karl Spiteri]

Tony just found the problem it was the fireboy module interconnecting both ignition circuits

[Karl Spiteri]

but still i cant understand

[Karl Spiteri]

Tony thats what i was inking that something is interconnected when looking into it its the grounds are but had a chance and changed the trio diode today and all is fine Thanks Karl

[Tony Athens]

I just redid this….. Your wiring connections seem to be correct

#1 is OK, maybe..

#3 is the sensing lead and needs to run the the output terminal of the alternator or another source you want to sense

#2——-Is the tach signal

Not sure what you have interconnected to the “other engine”, but you can only have on alternator that drives the tach –I.E., only use ONE of the phase tap terminals

[Karl Spiteri]

Hi Tony
no1 is connected to ignition
no2 is connected to rpm signal
no3 is connected to battery bank

Thanks Karl

[Tony Athens]

Look at the attached picture..

Tell me exactly want leads #1, #2, and # 3 are connected to, and what you “think” they are supposed to accomplish..

[Karl Spiteri]

Photo 2

[Karl Spiteri]

Thanks for your reply Tony couldn’t get better pictures I checked the 3 wires and they are as per diagram on the delco 3 wire hookup thanks again Karl

[Tony Athens]

3-wire Delco alternator hook up

1st———Good pictures showing the alternator your have and all the connections/wires that go to it

[Author]

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