Cutout relay

DD in WA

Member
I just rebuilt and painted the generator on my '42 H. Does there need to be metal to metal contact between the generator and the cutout relay? Just wondering if the painting could cause a problem.
 
BOTH the genny and cutout relay (or a voltage regulator) need a good ground to work. If the genny has a good ground and the relay has good contact with it that should satisfy both as being grounded.

John T
 
Run a separate new wire from ground to the body of the
light switch. After 70 some years the original
mechanical ground through the steering pedestal, switch
box, and those small cover screws is not reliable.
 
Since there are no lights or light switch on the ammeter box I assume this is less critical. The F post on the generator is connected to the F terminal on the cutout relay which has the resistor to control
charge rate. Let me know if the ammeter box ground is still important.
 
DD, good question

"Since there are no lights or light switch on the ammeter box I assume this is less critical. The F post on the generator is connected to the F terminal on the cutout relay which has the resistor to control charge rate. Let me know if the ammeter box ground is still important."

Here's my response, Bob M or Janicholson can correct me if I'm wrong

On the (later ??) Farmalls that had a manual Low High charge control LHDB Light Switch the Gennys FLD post wired up to that Low High Light switch (it had a Low charge field resistor on it in addition to the light dimming resistor) so that box (also housed the ammeter) needed a good ground

HOWEVER on (older ??) Farmalls that didn't come with lights and NO LHDB dash light switch, but had the F terminal on the Cutout Relay, the relay got its ground via the gennys ground (remember BOTH need one) or its own so it doesn't matter about the dash box having a ground or not.

That's my story and until its shown wrong IMA STICKIN TO IT LOL

John T
 
Yes to what John T said, with no light switch in the ammeter box there is no need for a ground there, however, your set up is unusual on an H. Using the resister in the cutout you will only have a charge rate of 2 amps. This is a common setup in power units that are norally run for long periods at a time, but not very common on tractors that are subject to frequent starts.
 
John, were on the same page. It was the really older Farmalls that never had lights at all where I saw the old cutouts with the extra 3rd little F terminal to provide a resistive ground for the gennys FLD post. On a lot of H's I saw the LHDB or a full fledged Voltage Regulator NOTTTTTTT the 3 terminal cutouts. But hey I haven't seen them all LOL


John T
 

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