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There is a resistance test that you can perform, usually outlined in the shop manual.
From past experience with a '90 and a '93, when a couple go bad, the rest are not far behind. I replace all eight at one time, just like changing spark plugs.
With the '93 I had far better longevity with Bosch brand versus any of the others. I was informed by a Ford truck mechanic that the glow plug timer was setup specifically for Bosch and it wears out the other brands quicker.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.