glow plugs or relay?? - Ford Powerstroke Diesel Forum
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Old 10-12-2011, 01:41 PM
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glow plugs or relay??

ehj,

since a week or so my truck wont start right up in the morning.
i have to try it like 6 or 7 times.
I tried plugging the block heater in, and when i do that is starts right up as usual.

I was thinking that my glow plugs have gone bad, but i read something aboud that relay.

how can i test wich one is causing the trouble??

thanks,
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Old 10-12-2011, 02:25 PM
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Grab a DVOM (DIgital Volt Ohm Meter). Measure the voltage drop across the GP Relay by placing the meter leads on each Large relay terminal when the glowplugs are active (you have about 1.5 to 2 minutes after the key is turned to wait to start). If the reading is 0.5 volts or higher the relay is toast. I like the Stancor 586-902 relay for a replacement. It will fit, no problem and you'll probably never have to get another one. Cheers!
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Old 10-15-2011, 08:37 AM
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relay

thanks,

i tried what you said and the relay was broken.
i put in the new one and tested that one to make sure and it is fine.
saved me some work, i was planning to just replace the glow plugs.
happy that i didn't.
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