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Well the older 7.3L had a glowplug relay that looks like a starter relay. Then in the later years they switched to what's called a GPCM or glow plug control module and they have been using them ever sense. It is located on all the 6.0L on the right valve cover. It has two big connectors ones green and other is black. Real easy to replace held on by three 10mm nuts. Hope this helps good luck.

Powerstroke57

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15y ago

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