Posted by John T on December 08, 2013 at 06:00:33 from (216.249.76.176):
In Reply to: diode for 12v bypass posted by gary in neb. on December 07, 2013 at 18:05:31:
So much easier (Like Jim N was talkin about) if it has the saddle mount mechanical push start switch cuz you can buy them that are exactly the same EXCPET FOR ones used on like John Deere 620 720 etc HAVE AN EXTRA SMALL SIDE TERMINAL that's hot ONLY while cranking and you run a wire from it to the coils high input terminal so you by pass any ballast ONLY while cranking. BUT since you say starter lug it sounds like THATS NOT what you have cuz on those type starters and switches you cant get to any starter lug grrrrrrrrrrr
Of course as youre obviously well aware, a wire to the starter lug would appear as near a short so if you apply the coils voltage to it THAT AINT GONNA WORK LOL. If it were a pure solenoid operated starter, you could use like a Ford solenoid that has the extra small IGN terminal which is hot ONLY while cranking and run a wire from it to the coil THAT WOULD DO THE TRICK NO DIODE NEEDED!!!!!!!!!!!
Not cuz you need that many amps, but just since it will have bigger easier to manage and wire up stronger leads, Id look for a 10 amp rated diode with a PIV rating of at least 50 volts. If I recall correct theres gonna like a 0.6 volt drop across the diode.
Or use a switch (momentary push would be fine) to feed hot voltage to the coil while youre cranking her over or even a toggle if you remember to turn her off once started
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