No the voltage in NOT dropped down to 12 volts with a resistor. It is a 12 volt system. Factory stock was two 6 volt batteries in series to give 12 volts. If you have two 12 volt batteries in it now, they must be connected in PARALLEL. If you are not familiar with these connections, find someone local to help you through this.
As far as how long to hold down the glow plug button, it depends on temperature. 30 seconds if it was shut down a half hour ago, 30 to 90 seconds for the first start of the day in mild weather, 2 to 3 minutes in really cold weather with some help from a block heater. My 656 (same engine) will start at 20 deg using only the glow plugs.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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