Just that the tractor is very hard starting in the cold even using the glow plugs. Once it's warmed up it starts fine....
But if I plug it in ( block heater) it starts fine. I noticed over the last 6 or 8 months it's been harder and harder starting.
I read that they can be tested with a continuity tester. If that is the case it seems like you could test them with out even removing them... There may be some good and some bad...
but if some are bad I'll replace them all.....
Thanks,
Chris