A good test just hook A testlight to B+ and touch the glow plug on the connector, wire connector removed, if the lamp light, plug is good. or you can test them same way at glow plug controller connector and that way you test the circuit at the same time.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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