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Manifold Heater Plug Wire


kevin the chicken

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Not kit car related but can't seem to get an answer anywhere else. I have an industrial tractor which has a single heater plug mounted in the inlet manifold. It is fueled by a coil of pipe running off the main fuel pipe and when the ignition switch is set to heat a small valve opens and allows fuel on to the element so that it heats up. Or at least it would if the wire was attached to it. Easy enough to replace but what size wire should I use, I would assume it would need to be bigger than most of the other stuff in the loom. There are no markings on the plug to say what amperage it draws.

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Similar manifold heaters in cars are controlled by the ECU via a relay and their operation is temporary dependant on engine temperature. Once up to a set level they are switched off by the ECU. Are you running TVO? Is your heater like that or is its operation constant?

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No its controlled by the ignition switch. You just give it 30 seconds of heat before you start. It's on a david brown diesel, early 70s so before the ecu was invented. It's a strange looking thing, just built around a skid unit. Came from rolls royce aero engines derby.

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No its not left on the whole time, there is a heat position on the ignition switch that you use before you turn it to start. At least that's my understanding. Once you turn from heat to start the plug is switched off and the valve inside shuts off the flow of fuel in to the element. I'll find out at the weekend if my wire turns up.

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