Hi guys, I've been having an issue with my glow plugs.

When I bought the car 2mo ago, the glow plug light was not coming on. I wasn't even sure if the plugs were coming on or if the bulb was burned out. I ended up replacing the older plugs with newer pencil style. I also replaced the wiring, fuse, and fuse box. The glow plug light would still not come on, but I could hear the relay clicking on and off. However, the main wire going to the plugs would only read 12V intermittently.

I would have to turn the ignition 2-4 times for the glow plug relay to click on fully and power the plugs (and read 12V). The glow plug light was still not coming on, but I could tell when the plugs were on as the interior dome light would dim for about 5-10sec, then go brighter. The car would start perfectly.

Thinking that the ignition switch had a loose connection, I replaced it. Apparently the old one was fine as I am still having to turn the key 2-4 times before the interior light dims, letting me know that the glow plugs are being heated. However, each time I turn the key, I can feel the relay (I put my hand on it) clicking even when it's not powering the plugs. The glow plug light still does not come on. I swapped the bulb with the working seatbelt bulb to eliminate the possibility of a burnt out bulb.

This morning, it was about 50 degrees outside. I turned the key 2-4 times and the glow plug light finally came on (for the first time ever), however it was dim. When I started the car, the light became fully bright for .5 - 1 seconds, then turned off. Is there a temperature sensor in the relay? Would it being colder outside have something to do with the light bulb coming on?

At this point, I am thinking that the relay is going bad. But before I spend $250 on replacing it, is there anything else I may need to take a look at? I've replaced all fuses in the box to rule that out.