I agree, but it needs to be cold when you check it.nos-stang said:If you are talking about the glow plug relay on a 7.3,one of the big post will be 12 volts all the time,the other will get 12 volts when the key is turned on,most of the time one of the posts will be burnt and be black,it is a very common problem on power strokes.
actually especially on the earlier powerstrokes the GPRs seemed to go out a LOT. I am even on my third one on my 2000, but I doubt I will have to replace this one nearly as soon.s_stang said:My experience has been bad glow plugs and not so much the relay.. When ya turn the key on does the voltmeter in the truck drop to 8 volts?
napa part number ST36TRUKPULR said:I did some searching through the books and found a continuous duty relay with a base that will bolt in place of the factory unit that is rated at 200 amps continuous (I believe the surge rating was 400 but would have to look it up again) had it on my truck awhile now and no more burned out GPR.
Would you have the Part # on that rely you got ??
You know a lot, wasn't meant to put you down Jon, but I was also pointing out stuff that needs to be thought about too. We can all learn from each other on this site because no one knows everything. Just because Ford built it and put it in doesn't mean it was right, just means it was enough to get by. Thus if you look at the relays for the glow plugs you will find that the superduty glow plugs use 10 amps each, the early model used 8 amps from what specs could be found on them, so that is 80 and 64 respectivaly and the relays that ford spec'd for them were 95 and 80 thus leaving approx a grand total of 15 amps worth of give to account for all the connections, the wiring getting to the glow plugs themselves and the amount of extra amperage that would be used on initial heat up or due to extremes such as cold or heat when they are operating. Thus they will get he job done..... for awhile, and as long as NOTHING else causes any extra draw in the entire circuit. Having a relay that passes that current on higher then required means it's not part of the restriction and heat build up, and thus isn't getting hot and burning up wiring and connections and drawing the batteries down more then needed.richter69 said:Just my observations, may just be me, what do I know................. :roll: