Re: Converting to 12 volt

Posted by John T on April 14, 2018 at 06:47:03 from (75.205.91.150):

In Reply to: Converting to 12 volt posted by Mark Taylor on April 13, 2018 at 19:40:18:

A "4 post start relay" often (NOT always) has

Two big posts, one is the BAT INPUT which has a big battery cable to the ungrounded battery post, the other
STARTER OUTPUT leads to the starter post/terminal.

Two small terminals, One wires to the START terminal on a typical starter switch (hot when depressed or in
start position). It "may" be labeled "S" or some other designation ???? I cant say !!!

The other "may" be labeled "I" (like on some Ford solenoids) which is to by pass an
ignition ballast resistor when cranking

How it works (IFFFF "some" older Ford type 4 terminal relays) is when you send voltage to the small "S" terminal current flows through the coil and returns to the battery via the frame ground, and when activated the two big BAT INPUT and STARTER OUTPUT are connected together so the starter receives voltage and spins. The "I" terminal is hot when S has voltage if needed to by pass an ignition ballast resistor.

NOTE on some of the older Ford type 4 terminal starter relays with the small "S" and "I" terminals the ground return was via the frame ground mounting connection. Again S received voltage when a start switch was in the start position and the ground return was via the frame

NOTE I have seen a few 4 terminal relays on which the two small terminals were S and Ground IE the ground current returned via the other terminal NOT the frame ground

NOTE they make 3 terminal relays but since you said 4 I wont go into those

HOW TO WIRE if you have a starter with a big post/stud terminal NOT an onboard mechanical switch, and want to start using a start switch/position and have the 4 terminal older Ford type solenoid as discussed above:

BAT INPUT to ungrounded battery post
STARTER OUTPUT to starter
S or other correct small terminals wires to the start position on a starter switch
I (if so equipped) is for ballast by oass which you may or may not have
Ground return for activation coil is often via the frame ground mount BUT NOT ALWAYS.....

NOTE not knowing what you have and with such little information this is ONLY MY BEST GUESS and may be wrong as rain so don't anyone have a calf. If I knew your solenoid and starter I could give a better answer SO NO WARRANTY

NOTE this is onlyyyyyyyyyyy one part of a conversion kit, theres much more to the story. To convert from 6 to 12 you need a 12 volt battery and be equipped to charge it,,,,,,,,,,,,a 12 volt ignition coil or a 6 volt coil with a ballast resistor,,,,,,,,,,possible ground changes,,,,,,,,,possible wiring changes

John T

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