Re: Farmall H 12 Volt Conversion.

Posted by John T on March 16, 2006 at 10:56:01 from (66.244.90.98):

In Reply to: Farmall H 12 Volt Conversion. posted by Bunchs33 on March 16, 2006 at 08:54:01:

Bunchs, Just sitting here and from what you say I cant be sure if you really mean an "electric solenoid" or a mechanical start switch (which normally has only 1 big external post where a battery cable attaches (the other underneath the switch and possibly a small one out the side) but will proceed based on you actually having and asking about an electric solenoid.

Its best at 12 volts to use a solenoid with a 12 volt rated coil. Otherwise, she may overcurrent and overheat, but could work a long time fine depending on how long its activated and its design.

Now, you ask about 3 or 4 terminals. On many older solenoids, ESPECIALLY the 6 volt units, they had the big in (from battery) and out (to starter) terminals plus a single small terminal possibly labeled S or possibly no label. Thats the activation terminal which leads to a push to start or a start switch which is HOT to operate the solenoid when in the START position.

On many 4 terminal solenoids ESPECIALLY the older Ford types mounted up near the battery, they had the 2 big in n out posts plus 2 small terminals labeled S and I. If you have one of those, the S is the activation terminal which wires to the start switch to operate the solenoid while, the I Ignition terminal is hot ONOLY when cranking and can be used to by pass an ignition ballast if the auto or truck or tractor had one. If you have no ballast then you just use the S terminal.

An electric solenoid has to have a starter with a drive gear (Bendix) that engages into the flywheel (mechanically or electrically) when she cranks, while many mechanical activated starter drive gear mechanisms use the lever action to push the drive gear into place and then the electrical switch closes to spin the starter motor and engine. Im just not sure what you have there so I cant fully give you an answer, sorry.

John T

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