Glow plug lights not coming on?

Answer 1

It may be your glow plug relay. They are widely available on the internet, or you can try to fix it, yourself. If you opt for the latter, then look for the relay on the driver's side of the engine compartment, just behind the headlight. Remove the pair of bolts securing the relay to the bulkhead, and unplug the relay from the wiring harness. Using a small Phillips screwdriver, unscrew the four screws that hold the relay together. Gently pry the relay apart. Inside, you will find a contact point that looks like the points in an old-time distributor. Take some wet-or-dry sandpaper and fold it in half with the course edges facing outward. Place it in the point gap and gently but firmly, move it back and forth until the carbon is scraped off. Reassemble and test.

Another alternative is that you have a bad glow plug. Remove each plug, one at a time and test it with a pair of battery jumper cables. Clamp the negative cable (black) to the base of the plug (where the threads are) and connect it to the negative post of your battery. Then connect the red cable to the positive battery terminal and the small threaded post sticking out of the plug, using due care and diligence not to touch the bottom of the glow plug to anything that will burn (like your skin). The bottom of the plug should glow red, or if you spit on it, will sizzle. That glow plug is good. If nothing happens, replace the plug.