856 delco 10si conversion questions

[Farmall m farmer]

I want to put a 10si on it but the original plug was gone and somebody just put spade connectors and they were unhooked so how do I hook it up I found a thread on here but it was confusing to me what is the best way to hook it up pictures would be great

 

[Jim.ME]

The picture below shows where the wires go. The switched excitation wire needs a diode, indicator light, or resistor in it if the power is coming from the same switch terminal as the ignition or a fuel shut off solenoid gets power from. Otherwise, back feed from the alternator to the ignition switch could prevent engine shutdown.

 

[used red MN]

The switched excitation wire needs a diode, indicator light, or resistor in it if the power is coming from the same switch terminal as the ignition or a fuel shut off solenoid gets power from.

(Jim with apologies) You won’t have to worry about this because on those IHs you kill the fuel by moving the throttle left over the detent to the stop position, nothing electrical involved. Connecting the original GEN dash lamp to excite circuit on the 1 terminal gives you a charge/no charge indicator. The site I used with all the IH wiring diagrams got boo-boo’d and hasn’t been fixed to my knowledge so I can’t help you beyond that. The early ones had generators and the later had Delco 10DN alternators, both required a voltage regulator. Your two spaded wires may be for a 10DN and coming from the regulator. The lamp wire goes down to the regulator as well, it’s up under/behind the fuel tank or inside under the dash.

 

[the tractior vet]

The picture below shows where the wires go. The switched excitation wire needs a diode, indicator light, or resistor in it if the power is coming from the same switch terminal as the ignition or a fuel shut off solenoid gets power from. Otherwise, back feed from the alternator to the ignition switch could prevent engine shutdown.


View attachment 156594

 

[the tractior vet]

wrong alt . for a 56 seires tractor that is what was used on the 66 series . The plug goes in from the rear . and the two clors for the wires should be yellow and black . But tonight don't ask me where they go with four fingers of C/R over ice what side the yellow goes left or right . They used the same Alt. that ya found on every Chevy/ GM built back in 68-71 , same alt same reg. Yea i am that flippen old / Fantastic years to be young .

 

[Jim.ME]

wrong alt . for a 56 seires tractor that is what was used on the 66 series . The plug goes in from the rear . and the two clors for the wires should be yellow and black . But tonight don't ask me where they go with four fingers of C/R over ice what side the yellow goes left or right . They used the same Alt. that ya found on every Chevy/ GM built back in 68-71 , same alt same reg. Yea i am that flippen old / Fantastic years to be young .

I realize the I posted a picture of the "wrong" alternator for the tractor, but if you read his first post of the thread, he posted he wanted to put a 10SI on it. I posted a picture of the alternator he asked about.

Did you read and understand his first post, before chastising me for the wrong alternator? Perhaps "four fingers of C/R over ice" affected your understanding of the post.

 

[matthies]

But won't he have to do something with the wires at the regulator if this has an external one ? I know some of the delcos that plugged in the back before the top plug ones were internally regulated but far and few. thanks

 

[used red MN]

But won't he have to do something with the wires at the regulator if this has an external one ? I know some of the delcos that plugged in the back before the top plug ones were internally regulated but far and few. thanks

Not sure who’s reply your addressing. Jim’s reply 2 does inform the OP what is needed for the connections for a 10si install. I added in reply 3 that only a keyed source for the excite circuit (terminal 1) works and does not require an anti-feed back device. Whether the OP’s existing wires (or at least the required excite circuit) are plug and play would be up to the OP. If he is replacing an original 10DN, yes he would need to change the wiring from stock.

 

[Jim.ME]

But won't he have to do something with the wires at the regulator if this has an external one ? I know some of the delcos that plugged in the back before the top plug ones were internally regulated but far and few. thanks

If the original was a 10DN (externally regulated with the plug straight in the back) the plug and wiring would be different. I answered the question of where the wires go on a 10SI with a picture. Without the info of what alternator is being replaced it is hard to say if wiring changes are needed or not.

 

[Farmall m farmer]

I used the existing exciting wire that comes from the dummy light and it’s hooked to the number 1 terminal than made a jumper wire between the battery lug on the back of alternator to the number two on the alternator and it works fine and hooked up the ground

 

[used red MN]

I used the existing exciting wire that comes from the dummy light and it’s hooked to the number 1 terminal than made a jumper wire between the battery lug on the back of alternator to the number two on the alternator and it works fine and hooked up the ground

Excellent work! It appears in the end that C/R has nothing to do with this thread.