I need to help locating my glow plugs on my Diesel engine. I do not have a repair manual to do this. I plug my truck in at night and it starts now problem warming up, but when I drive it to work I have a hard time getting it started in the cold evenings I have to keep turning the key on and then off like the glow plugs aren’t working properly. I would like to locate the ones on the truck and get them replaced to solve my problem any help is appreciated.