Your alternator has 12v constant at the single "big" post and the plug. The wire labled 1 or ig at the alternator is keyed 12v. If your harness is good and the resistence wire is the problem you can purchase a kit to replace the resistance wire from the plug on the fire wall to the alternator. The kit uses a resistance diode instead of a single strand wire. The diode is replaceable. The two constant 12v wires on the alternator go to the same post on the starter relay on the firewall. I have replaced several engine harnesses on these tractors the last few years, so look closely it may be time to think about a harness. From the starter relay on the firewall the charge voltage goes to the starter by the way of a short harness. On the starter it is the big post that shares the battery cable. From the starter post it charges the batteries. The cab gets power either from a wire off of the starter post or the starter relay. Off hand I think it is the relay. The cab power wire comes in by the load center. It usually is attatched to the bottom of the left buss bar. The left row of circuit breakers are 12v constant. When you turn the key the right buss bar should then have 12v. It is not uncommon for a nut on the circuit breaker to loosen and melt a little plastic between the nut and the connection. Sometimes tightening the nut will help and sometimes you have to remove the nut and scrape the melted plastic from the surface then put the nut back on. What I do to quickly test a circuit breaker is use a jumper wire and touch it between the breaker posts. If the circuit comes on then look at that breaker. I am also pretty sure your volt gauge lead is on the starter relay also. A qick side note. I have had some customers on older combines go through alternators quite frequently also. Most of the time if they take the time to freshen up the wiring over the engine the problem goes away. If your wire is corroded inside of the insulation it has to carry extra amperage. With the heat of the engine this problem is compounded. Just something to think about. Sorry this is so long but hope it helps.
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