7.3 power stroke

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Glock 40

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Did you test the relay? Its not very hard if you have a test light or volt meter. Lots of videos on youtube for that process. No reason to swap it without testing.
 

Okie4570

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You won't notice one or two bad glow plugs even with really cold temps unless maybe a puff of white smoke at start up, but it will crank fine. If one entire side is out or both sides due to relay, module or wiring harness you'll for sure notice lol. Here's to hoping it's just the relay!!! :)
 

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