Is this TO-30 wiring correct??

JayP · Mar 10, 2012

I"ve had this TO-30 for a few years-bought it off a farmer that had rewired it. Always been suspicious but just getting around to putting it on paper. Can someone confirm this wiring? I can"t figure why the lights are grounded like they are,etc.
Please disregard tripicates-they are all the same.

Richard L · Mar 10, 2012

If it is 6 volt it should be pos. ground. maybe this will help http://fergusontractors.org/fena/tractor-info/wiring-diagrams

rvirgil_KS · Mar 10, 2012

What kind of alternator? Diagram markings indicate it could be a Delco that requires external regulator. If Delco, and the R and F are on outer edge and the connectors are like this --- --- it would indicate an internal regulator. If the R and F are on back and positioned like this l l it would indicate that it is an alternator requiring external regulator which you do not show.

As drawn the R and F connections are incorrect. Determining which type of alternator will determine how it is wired.

Amp gauge and switch wiring is not correct. Bat wire from alternator goes to one side of amp gauge, other side of amp gauge to battery side of start solenoid/switch.

Power input for the ignition and light switches should connect to alternator side of ammeter.

Alternator should be negative ground as indicated.

Lights can ground through the case, or an extra ground wire could have been added.

To check wiring at ammeter, turn on lights with ignition off. If ammeter swings negative it is correct, if it swings positive then reverse ammeter connections

John(UK) · Mar 11, 2012

There are a couple of things wrong with the diagram, if you email me at the address below, I will send you the correct one you need. Just tell me again what you have and what Alternator 1 or 2 wire...John(UK)[email protected]

JayP · Mar 11, 2012

OK, great to hear from everybody.
It is a Delco alternator with BAT on backside lower left. The R F connection is a push-in rectangular connector located on backside outer rim top left.
12 volt system
Wire going to lights (one wire,not two) is connected to ground behind starter.
This tractor ran okay but amp guage always showed negative,never in positive. I also have to recharge battery from time to time.

Duner Wi · Mar 11, 2012

I believe you have an alternator used by GM 1963 -1972 pretty much. So if you want to keep the alternator you have you will need an external voltage regulator. You can see a photo of this in Rock Auto . One application would be 1965 Corvair.
Airtex Wells # 1V1038. I think most all GM alternators from GM 1973 thru 1985 will bolt up but starting about 1980 the bolt holes may be metric. Your wiring diagram is quite messed up from what I can tell. If you use a 10Si or 12 Si from GM 1973 thru 86 the wiring will all be the same. What you have has already been pointed out by virgil but thought I would add my 2 cents.
If yo decide to use the later GM alt. # 1 on alt.goes to ign Acc. term. # 2 sense term can go to batt term on alternator but prefer to read the voltage back farther nearer the battery. Probably the lug that feeds directly from battery. This location will read more correct if you have accessories such as lights. There was a reason GM did not read the voltage at the batt term on the alt. Good luck!

jfnewt · Mar 18, 2012

If lights have one wire going all the way around
this wire should not be grounded to starter area,your grounding a positive wire thier.I m suprized it hasn t melted the wire yet

Is this TO-30 wiring correct??

JayP

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Richard L

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rvirgil_KS

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John(UK)

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JayP

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Duner Wi

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jfnewt

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