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Turned out to be my ignition switch! I done an ohm test from the service manual. A and B works on assories but A to C on glow plug preheat is dead, as with A to D on startup. What’s strange is I can put A To C and hit start, and the glow plugs heat. So Crazy. I was thinking about moving C to D, and running a push button toggle switch with a jumper from A to C to preheat the glow plugs. It should work until I get My new ignition switch here and installed, or I just do cold starts until it gets in. Hope this helps someone somewhere.

1997 New Holland wiring problem
New Holland Tractors
Replies 2 Post by dmoore5789

I recently got a 87 NH 1925, and it needed a starter. I bought one and installed it. No power to instruments. I tested tge relays, but not tge safety switches. That�s next. I Checked fuses and main 30 amp. All ok. I found the previous owner cut thw hw14 and tge hw11b wire to a toggle button. I want to fix it correctly. My question is, Where do these go? The repair manual says to a 6amp diode, but there�s only 2 diodes all wired correctly. If that�s it, where can I find the diode to purchase it at? The power from these are from the Seems tge power from the ignition switch goes to tge hw14 into tge 6amp diode to tge hw11b, one direction. All help appreciated. Ps. Testing the ignition switch next. Also, can tgese simply be spliced together?

1997 New Holland wiring problem
New Holland Tractors
Replies 1 Post by dmoore5789