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Message: <blockquote data-quote="Dan in PA" data-source="post: 136915" data-attributes="member: 25392"><p>Hello. Just joined, thanks for having me, and looking for some help. L230 with glow plugs that don't heat. I took the old glow plug module out and hooked it up on the bench and could not get an output so I ordered a new one and replaced with no help. I have a service manual (maybe not the best) with a wiring diagram that I used to hook it up on the bench with a meter and power supply and still no output so I must be missing something. The manual has no theory of operation for the circuit that I can find. The module has 8 pins, hot and ground, one for each glow plug, signal, and feedback. I put 12v on signal on the bench, the machine had 10.5v on that lead with switch on. I'm assuming the feedback is for the indicator. Any advise, theory of operation, or trouble shooting guide would be appreciated. Thank you.</p></blockquote><p></p>