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Old 04-12-2012, 01:07 AM
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Fellro Fellro is offline
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The glow plugs do not need to be on any more than to start it, and then a little bit after. If they continually cycle, it will shorten their life just like starting it and only running it for a short time for a lot of times would. They will generally heat up and burn out if held on continuous, regular constant cycling really isn't much different, and if you consider the heat of combustion in there as well, it is pretty warm.

The ground side small terminal probably is just for the light, hadn't thought about it. That is not the proper way to control the relay though, and really, not that effective. If done correctly, the ground side will have no effect, as it grounds through the base, that little wire is not enough capacity to handle the duty of energizing that big relay. The glow plug relay works just like the starter relay/solenoid on the fender.
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My trucks:
The workhorse, 86 F250 4x4 6.9 nat aspirated, 3.25 exhaust, custom intake, electric fuel pump, otherwise well used stock... not real pretty but just loves to work!

The other heavy hauler, 92 F350 2wd dually crew cab, flatbed/toolboxes, 92 Cummins VE 12V with intercooler, NV4500 manual

The beater: 88 F250 4x4, 5.8 5 speed
The project ... 1978 F150 4wd shortbed 351 auto

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I do most all of my own work so I know who to complain to..Roger
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