I have a 23c and need to know how to wire the glow plugs and how long to heat them as i just got my 2nd set of them and dont want to buy any more?
I got the tractor in a basket and my book did not cover wiring.Thanks,J & L Farms.
I have scanned the wiring diagram from the workshop manual, so that should
be of help to you. Click on the link below to open the wiring diagram.

I usually heat my glow plugs for 60 seconds and have only lost one glow plug in 25 years–probably from old age. I did burn out the resistance coil once but had it welded together again and it’s been fine ever since.