Question about 1987 Ford F 350
You should have three wires one is battery voltage all the time on the other side of the relay gose to the glow plugs, the thrid wire which will be the smaller of two is ing control when the key truned to the run side you should have 12 volts for uo two 30 secands . so in that time frame all three wires should voltage, if the wire going to the glow plugs has no voltage and the other two do replace the relay
Posted on Dec 22, 2008
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Posted on Jan 02, 2017
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