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After changing all the glow plugs the relay started working normal again and truck fired right up. Now I’ve managed to crack one of my heater core tubes getting that pain of the passenger glow plug out. Looks like I’ll have plenty to keep my busy this week...

Card is out and doesn’t look burnt up anywhere like I’ve seen on other peoples cards, so hopefully I can get this cleaned up and it works!

This should just pull straight out now? Or is there something else I need to do first?

I got it open! Now to get the card out, that might be trouble in itself...

Ok I hate to ask a dumb question but how does this box open up? I feel like I’m missing something very simple here right now and have been fiddling with it for 30 min now

The 25 down to 13 is at the glow plug itself. Thank you for the reply also. Guess it’s probably time to pull my card and check it out most likely

I have 25v in at the top of my relay, 13v at the bottom and 25 initially on the turn of the key that drops to ~13v after a couple seconds. The relay is getting grounded but it doesn’t stay on long normally shutting off again after just a second.

Hello, I’m pretty new to this website. I have a 1985 M1028. Recently I’ve had to crank my truck a lot before start up. Even give gas while trying to start up to get it to fire. I can hear the relay click on and off. It does this multiple times, clinking on then a couple seconds later...