AlbionWood
Bronze Member
Backing up a little from my earlier query about the solenoid on the Ford NH 1920. This tractor was running fine, always started right up, except the neutral safety switch was kind of fussy - had to jiggle the shifter to get it to close. Shut down normally one day, next morning climb on and turn key - nothing! Check battery - 12.8V. Same at solenoid terminal - 12.8V across the terminals. Wait, the fusible link appears to have broken off... connect with new ring terminal, still won't start. Jump solenoid (hot terminal to spade connector) - nothing. OK, solenoid dead.
But wait, there's more... Checking the ignition switch, get screwy voltage readings. Hot lead in is at 12.8V, no problem. Turn to "Run" = about 7 V. ??? "Start" = less than 1V. Glow plugs = less than 1V. Not zero, mind you, but about 0.3V.
So - ignition switch bad too? Would this maybe have caused the solenoid to go bad, not getting a full 12V to turn the starter motor? What are the chances that the safety relay is bad, too, and is there any way to test that? (It's a four-blade relay, mounted above the starter motor, not quite sure exactly what it does really...)
(BTW, I tested all these after shorting across the neutral safety switch, so that isn't the problem. Took battery out and charged overnight just to be sure.)
Ford NH 1920, UP 31629 (mfr 1992), 4-cyl diesel
But wait, there's more... Checking the ignition switch, get screwy voltage readings. Hot lead in is at 12.8V, no problem. Turn to "Run" = about 7 V. ??? "Start" = less than 1V. Glow plugs = less than 1V. Not zero, mind you, but about 0.3V.
So - ignition switch bad too? Would this maybe have caused the solenoid to go bad, not getting a full 12V to turn the starter motor? What are the chances that the safety relay is bad, too, and is there any way to test that? (It's a four-blade relay, mounted above the starter motor, not quite sure exactly what it does really...)
(BTW, I tested all these after shorting across the neutral safety switch, so that isn't the problem. Took battery out and charged overnight just to be sure.)
Ford NH 1920, UP 31629 (mfr 1992), 4-cyl diesel