A couple of years ago, I updated the glow controller system on my '83 K2500 to the '85-newer controller (with the resistor mod). Everything works well and it starts great except when it's over about 95 degrees outside and the truck has sat for less than an hour since it was last ran. The glow controller will not cycle the plugs at all and this engine needs some glow at all temps. I want to add a manual momentary switch to cycle the glow plugs manually when the controller doesn't turn them on during these hot days. Does anyone know how to wire in a momentary button that could be used when the regular controller doesn't cycle? I have an original old-style glow plug relay and momentary button to use, just not sure how to get it set up.