Glow Plug Heater Wiring Diagram. Therell be primary lines which are represented by l1 l2 l3 and so on. Remove the dash cluster and locate the wire running to the glow plug liht or on a 25 locate a spare bulb holder fit a bulb cut the feed wire from the plug and extend it to the engine bay this will connect to the relay as a glow plug light the wiring has to be worked out as it varies from relay to replay try to get hold of the glowplug relay and wiring from the donor.
A new relay has been fitted and all glow plugs are fine. Essential tips for safe electrical repairs. Internal wiring of bj40 bj42 hj42 glow relay manual ih8mud forum.
3 live from the ignition switch.
And i have started it a few times while the glow plug light still flashing. There are 2 multi plugs on the relay one for the heavy power feed. To test your glow plugs simply connect a 12 volt test light to the positive battery terminal. I had to take off a piece of plastic and drop the fuse panel to get to it and sure enough a 50a fuse there was blown.