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Nice Diagram Big Boy, I see you have that 10 ohm current limiting protection resistor I like feeding the Alternators excitation circuit and the diode just in case the alternator tries to backfeed the coil (though sometimes unnecessary when 10 ohm resistors in place), and I like the 10 gauge wire use in the charging circuit. Theres a few comments I have, MOST OF WHICH are just how I do things as far as OVERKILL OR OVERENGINEERING MAY BE, not to say your wire gauges wouldnt work just fine. Yours may well be what the factory used, I just use bigger wire in a few places, purley a matter of personal choice. 1) I would probably use 12 Gauge from the Ammeters - Load terminal to feed the switch, the load is around 4 amps for ignition plus lights n gauges, so your 16 will suffice fine, but Im just a stickler for avoiding any unnecessary voltage drop, ESPECIALLY to the coil, even if its negligible or un measureable lol. 2) Likewise, I would use 14 or even 12 Gauge for the coil feed from the switch, even thouhh the ignition load is only around 4 amps, I HATE ANY VOLTAGE DROP especially to the coil (In cold temps when battery is inefficient plus starter draws high current) and even if use of larger wire wouldnt yield any measureable improvement. 3) Its the same point electrically so no problem, I would likely show the alternators excitation feed circuit direct off the switches IGN terminal (same place that feeds coil when ON) 4) SORRY, Im unfamiliar with that tractors wiring and components, so not quite sure whats going on with the wire from the switch to the Solenoid to the coil??? (Your left wire on the Solenoid, NOT the activation to crank right terminal). When switched to ON, the switch powers up any gauges PLUS the coil, of course, but Im not sure how/why that Massey wires to the Solenoid ?? I understand the solenoids lil right side activation start terminal which the switch feeds in the START mode via the Neutral Safety Switch to crank her, its just Im unsure of the solenoids other lil left terminal and how its tied in with your wiring to the coil n switch?? On electric solenoids like some Fords used, the extra lil I terminal on the solenoid (NOT the S activation terminal) was hot ONLY while cranking and what it did was serve to by pass any ballast resistor so the coil got unballasted battery voltage ONLY WHILE CRANKING. If the tractor used a 6 volt coil and an external ballast and was similar to Fords extra I terminal solenoid use, that extra I terminal fed the coil by passing the Ballast ONLY WHILE CRANKING. Sorry, Im unsure whats going on in the Massey system??? It appears from your diagram the necesary curent path is there to feed the coil when ON as necessary, Im just unsure why n how you show it to n through the solenoids other lil left side NON activation terminal?? I understand it if its like the Fords solenoid and you had a 6 volt coil plus an external ballast, but in that case the diagram should show the ballast and that extra lil solenoid left terminal connected to the coil maybe??? Good diagram so best wishes n good luck John T, retired EE, NOT a Massey knowledgeable person however, so do what the Massey guys tell ya over me.
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