12 volt conversion confussion

Blair(ont) · Jun 6, 2018

Going to switch my 8N over to 12 volts. Order alternator from Ebay which is advertised as "New Alternator Replaces Delco 10SI For Agricultural Equipment 1100582 7186-3". Made in China.

I thought I was ordering a 3 wire alternator but not sure what I have. No Instructions. It has a 3 post connector in one place and a single connector on the end. I am hoping someone has one these and are more familiar with the wiring than me. Any ideas or thoughts would be helpful

JMOR · Jun 6, 2018

(quoted from post at 15:57:48 06/06/18) Going to switch my 8N over to 12 volts. Order alternator from Ebay which is advertised as "New Alternator Replaces Delco 10SI For Agricultural Equipment 1100582 7186-3". Made in China.

I thought I was ordering a 3 wire alternator but not sure what I have. No Instructions. It has a 3 post connector in one place and a single connector on the end. I am hoping someone has one these and are more familiar with the wiring than me. Any ideas or thoughts would be helpful

10SI has a 2 spade connector & a post. Sometimes the 2 spaces are covered by a plastic plug.

Blair(ont) · Jun 6, 2018

This one has one post and 3 spades that are opened. If it is one wire what is is the other 3 spades for

rvirgil_KS · Jun 6, 2018

The third spade is probably for an electronic tach

If mine, I would connect the 2 side by side spades as a 3 wire and ignore the third spade

R Geiger · Jun 6, 2018

(quoted from post at 15:04:07 06/06/18) The third spade is probably for an electronic tach

If mine, I would connect the 2 side by side spades as a 3 wire and ignore the third spade

When you let the smoke out you could just order the complete kit from here. It saves confusion.

JMOR · Jun 6, 2018

If you are not going to find an answer (you will in time), then I would connect it as a one-wire (not using any of the 3 spades) and see if it charges to correct battery voltage.....easy. From what I have read, it will be fine.

Bob · Jun 7, 2018

(quoted from post at 16:22:27 06/06/18)

(quoted from post at 15:04:07 06/06/18) The third spade is probably for an electronic tach

If mine, I would connect the 2 side by side spades as a 3 wire and ignore the third spade

Click to expand...

When you let the smoke out you could just order the complete kit from here. It saves confusion.

rivirgil is correct. The third terminal is the "tach" terminal, and can be safely ignored if not needed in your application.

(The one with the red wire in this photo.)

Just treat the other two terminals as if it had only two flat terminals.

#1 (green in the photo) = "excite" and #2 (black in the photo) = "voltage sense".

Alice Chompers, "back in the day" (when the corporation existed and built "tractors") used alternators with the third flat terminal to operate their "tachs", as an example.

Tim PloughNman Daley RIP · Jun 7, 2018

I concur with the others - ebay is the LAST place I'd buy any new parts from, maybe. All the reliable parts suppliers I deal with offer tech support and certainly their conversion kits contain instructions. You don't say if you have a front mount distributor or an angle (side) mount unit. It matters which side the generator is now on. Get out your copy of "WIRING PICTOGRAMS by JMOR" and use as the roadmap for wiring these N's whether 6V or 12V. DO NOT DEVIATE. This may help...

Tim *PloughNman* Daley(MI)

Blair(ont) · Jun 7, 2018

Thanks for diagram, thats what I needed. I have side a 1950 8N with side mount distributor and generator on left side. I am hoping that
everything goes to plan with ebay purchase

Blair(ont) · Jun 10, 2018

One more question. I have a 6 volt coil, I have ordered the ballast resistor but do I need a second resistor to drop the voltage to the coil from 12 to 6 volts or does the ballast resistor do that. Thanks

Blair

R Geiger · Jun 10, 2018

(quoted from post at 09:30:09 06/10/18)
One more question. I have a 6 volt coil, I have ordered the ballast resistor but do I need a second resistor to drop the voltage to the coil from 12 to 6 volts or does the ballast resistor do that. Thanks

Blair

Normally a side mount distributor does not use the ballast resister. I am not sure if it would do the job or not. It would be better to just get a 12 volt coil. That is what I did. I did use a resistor in the dist wire for a while, but it was touchy starting, I think the resistor was dropping the current flow too much. When I installed the 12 volt coil and removed the resistor, all was well.

Blair(ont) · Jun 11, 2018

If you do not need a resistor how does everyone use a 6 volt coil with a 12volt battery

JMOR · Jun 11, 2018

(quoted from post at 10:06:49 06/11/18) If you do not need a resistor how does everyone use a 6 volt coil with a 12volt battery

rom factory, side distributor units used 6v coil & 6v battery (7.2v running/1.6 Ohms= 4.5 amperes coil current. If used on 12v (14.2 running) then to achieve that same 4.5A, you need total coil plus resistor value of 1.6 X 2 =3.2 Ohms, or a 1.6 Ohm resistor along with the 6v coil. Or as some do, use the IC-14SB 'true 12v coil) and skip the resistor, as the SB14 has 3.2 Ohm primary. Or one of several other equivalent 12v coils.

12 volt conversion confussion

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