Delco 3 wire alternator

SVcummins · Oct 24, 2019

Which terminal do I send the 12 volts to for the excite circuit on the alternator ? Delco 10 si thanks

Ultradog MN · Oct 24, 2019

This is a good, simple diagram.
Has some interesting info on 10si and 12si alternatators there too.
Scroll down a ways

Bob · Oct 24, 2019

<img src = "https://www.gondtc.com/~blweltin/Bob/AlternatorHarness3.jpg">

A "194" or equivalent indicator lamp or a 10 Ohm, 10 Watt resistor can be used instead of the diode. All three options work equally well.

SVcummins · Oct 24, 2019

Thank you that?s what I needed

SVcummins · Oct 24, 2019

Thanks a bunch bob

Geo-TH,In · Oct 24, 2019

I like using an idiot light which tells me when alternator is charging. I apply 12v to the second wire via the ignition because my new alternator had a small paracitic drain if I didn't switch the power off.

SVcummins · Oct 24, 2019

I always run a switched excite circuit but couldn?t Remember which terminal it was

SVcummins · Oct 24, 2019

Napa even had the plug for the alternator so it was east to hook up and no more spade terminals that won?t stay on .

Duner Wi · Oct 25, 2019

Quote from UltradogMN article

The Number two "sense" terminal is often connected to the BATT. terminal at the back of the alternator. This is the simplest connection and the least desirable since it is measuring the alternator output and not the voltage at the load connections.

Geo-TH,In · Oct 25, 2019

I run both terminals through switch so when tractor is off all power is removed from both wires.

A small drain won't hurt if you run tractor every day. however tractor may not get used much in winter. Cold and a drained battery is not good.

Delco 3 wire alternator

SVcummins

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Ultradog MN

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Bob

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SVcummins

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SVcummins

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Geo-TH,In

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SVcummins

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SVcummins

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Duner Wi

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