well it is and isnt.problem is if you dont have either a diode OR a light voltage CAN backfeed to the ignition and tractor wont shut off.some folks i think use the accy poition on an aftermarket key switch to break that line and keep it from backfeeding from alternator.a diode of course works sort of like a check valve that only lets voltage flow one way,while a light bulb actually raises the resistance up to where current wont flow.the indicator light on the dash of your car or truck does the same function.it may or may not be neccessary depending on how your tractor is wired.ive changed all my fords over to 12v and personally i use both simply because i work them a lot at night in the heat of summer,and the guages are not lighted.overkill of course.
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