[FrankLanger]

How does one check glow plugs, if they seem to be working (to ensure they keep working)? Do they wear out gradually, or burn out suddenly like a fuse/lightbulb? How can one tell if they are still good or need to be replaced? Is there a normal replacement cycle, or can they last many years?

For someone not mechanically inclined, is there a quick check, or does one need to dismantle things to get at them?

I'm hoping it's like checking spark plugs on a car--unscrew, look, clean, re-install....

Thanks for any replies.
Frank.