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Power Strokes
94-97 Tech
glow plug relay shutoff switch...
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[QUOTE="Bugman, post: 1464937, member: 2289"] I really don't see any reason to disable them. Years ago when owners first started putting switches on the relay they would say that it would extend the life of the relay and plugs. I found that the factory relay was the weak link in the system and corrected it. I am going on over 17 years on my Stancor with zero problems. I tested my glow plugs last fall and they are all still good with close to 200,000 miles on them. And I bought a bunch of them when Autozone was selling them for less than a buck. Some I have given away and some I have sold over the years as I found out that I didn't need a lifetime supply of them I also don't see where it is a waste to fire them up for so long. At the most all they are costing you is very little in fuel over the life of the truck. As I mentioned if you want to shut them off then all you need is a simple on/off switch placed in line with either the hot side of the relay or if you really want to control them yourself then with the PCM side that provides the ground for the relay. [/QUOTE]
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