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Excellent point. To help prevent this, you may want to consider performing the firewall resistor bypass and feed the glow plugs 12v.

I'm certain folks like Warthog and Antennaclimber will have much sounder council. But based on your pic and symptoms the first thing I would check is whether or not you have an isolated relay. The system works by grounding the relay coil when energized. It sounds like the coil has power...