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Farmall & IHC Tractors Discussion Forum
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Farmall A wiring

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bigr

05-28-2007 08:23:29




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I'm rewiring my A and bought a new harness from OEM parts. New cutout, generator rebuilt, light switch and ammeter are good. There are 3 terminals on the cutout. Per the IH service manual this is how I have them wired.
Bat to + side of ammeter
F to the resistor on the back of the switch and also to F on the generator
L(gen?)to the A terminal on the generator
When it's wired like this the ammeter shows a 15-20 amp discharge. Is it possible the resistor is bad? It's the only thing not new. Or is the wiring wrong? The lights work with the switch. I haven't got the motor running yet just doing the electrical. Thanks for any help!

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marty johns

05-28-2007 19:28:39




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 Re: Farmall A wiring in reply to bigr, 05-28-2007 08:23:29  
bigR listen to john T and go to BOB M.'S wiring webpage! I rewired my A last year and what a help it was!!!!! !!



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Bob M

05-28-2007 08:56:19




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 Re: Farmall A wiring in reply to bigr, 05-28-2007 08:23:29  
Sounds like it's wired up wrong. If your A has lights there should be no connection to the cutout "F" terminal. Punch below for a diagram.

However if you actually have a voltage regulator now (4 terminals: ARM, FDL, BAT and L) use the diagram for the Super H/Super M here:

Link



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bigr

05-28-2007 09:36:51




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 Re: Farmall A wiring in reply to Bob M, 05-28-2007 08:56:19  
I have a 3 terminal cutout per the generator shop that rebuilt the generator. I have a Mag but I don't think that makes a difference. The diagram makes sense. I'll check it out. I also have the 4 position switch with positive ground. I'll also check on John's idea's. The VR or cutout has 3 terminals on top l, bat, and f. I'll check underneath.



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John T

05-28-2007 08:46:11




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 Re: Farmall A wiring in reply to bigr, 05-28-2007 08:23:29  
Im afraid youre mixing apples and oranges. What youre calling a "Cutout" might actually be a full fledged 4 terminal (BAT FLD LOAD ARM) Voltage Regulator and I say that cuz you mention a L terminal which a 3 terminal (BAT ARM FLD) would NOT have!!!!! !!! and if its being used to replace a simple 2 wire Cutout Relay (BAT GEN). it can still be made to work REGARDLESS provided its wired correct:

On the 2 terminal Cutout Relays (BAT GEN) BAT wired to the load (NOT battery/starter) side of the ammeter and GEN wired to the gennys ARM post. The Field post on the Genny wired up to the light switch PROVIDED it was the correct LHDB switch which regulated the gennys charge rate.

On the 4 terminal VR (BAT FLD LOAD ARM) NOTE theres often a terminal underneath or off on one side all by itslef which is the ARM while the 3 side by side terminals are BAT FLD LOAD. they wire:

BAT to load side of ammeter FLD to gennys Field post LOAD feeds hot battery voltage up to the light switch (its BAT INPUT terminal) ARM to the gennys ARM post

NOTE if you replace a 2 wire Cutout Relay with a 3 or 4 terminal VR, the gennys Field post DOES NO LONGER WIRE TO THE LIGHT SWITCH. The time the gennys Field post wires to the light switch is when you use a 2 wire Cutout Relay, but with a 3 or 4 terminal VR the gennsy field post wires to the FLD terminal on the VR If it were only a 3 terminal (BAT ARM FLD) VR with no L terminal it can still work but loads like lights or ignition get hot battery voltage from the ammeters load terminal, same one that wires to BAT on the VR. Check out Bob M's Wirign Diagrams and see for sure what that black box youre callin a cutout really is n let us know. Does it have 2 (BAT GEN/ARM) or 3 or 4 (maybe one on a side or underneath) terminals)????? ????? ????? ?? Are the terminals labeled like BAT ARM FLD LOAD or ONLY BAT ARM FLD or what???? Again since you mention a L terminal I suspect its a 4 terminal VR and maybe ARM is underneath? LET US KNOW

Does your Light Switch have LHDB positions????

Are you at Positive or Negative ground???

Have you polarized the Genny????

John T

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bigr

05-28-2007 19:17:03




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 Re: Farmall A wiring in reply to John T, 05-28-2007 08:46:11  
You were right. There was a terminal under the Voltage Regulator. Wired it up per your instructions and it works. Thanks! Another question. The terminal on the Mag goes to the kill switch. If you run a continuity tester between the terminal and ground I'm assuming there should be no continuity, correct? On my rebuilt mag there is. Does that mean that the fiber gaskets aren't right?



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