1986 Ford F250 Manual Glow Plug Switch Installation Wiring Diagram

seven.3L IDI Manual Glow Plug Control Switch

How to Wire & Install a Manual Glow Plug Switch on a 7.3L IDI Diesel

Applicable Models:

1988 - 1994 Ford F-250, F-350, F-Super Duty

Applicable Engine(s):

International 7.3L IDI V-viii diesel (naturally aspirated & turbocharged variants)

A transmission glow plug activation switch is a somewhat common modification to the factory 7.3L IDI glow plug organization. Rather than assuasive the mill controller to command glow plug heating cycles, a momentary push style switch is mounted in the nuance that controls the arrangement in an "on demand" mode. With this setup, the glow plugs are merely energized with the key in the "run" position and the momentary switch depressed. The glow plugs will only received ability while the switch is depressed, typically for 7 to x seconds (depending on ambient conditions) before starting.

The benefits of transmission glow plug control is that it allows for the glow plugs to be cycled but when they need to be. Commonly, the glow plugs are cycled prior to every start. However, the glow plugs are non always necessary for starting when the engine is notwithstanding warm (i.e. was recently turned off). This modification allows the commuter to cycle the glow plugs just equally needed. A x second cycle may be necessary on a common cold Wintertime morning, while a quick 5 second wheel is all that's needed on a hot summertime day. In addition to giving the commuter full control, this can increase the life of the glow plugs since they are likely to be used much less in most cases.

The danger of installing a manual glow plug switch is that a driver may bike the glow plugs for too long. Anything more ~15 seconds of heating may damage the glow plugs and, in this setup, there is no fail safe - the driver has 100% control of the glow plug bicycle time, and the controller no longer has the ability to switch off the glow plug relay.

Manual Glow Plug Switch Installation

Disclaimer - the installation of a manual glow plug activation switch overrides the factory system and removes all neglect safes. It is therefore possible to over wheel the glow plugs, possibly swelling the glow plug tip and/or increasing the take a chance of a tip breaking off inside the combustion sleeping room.

• Remove the white wire from the glow plug relay and cut off the last. Install a crimp or wire nut on the cease of the bare wire, tape it up, and tuck it away so that it is secure - this wire is no longer being used.

• Cut the bluish wire for the wait-to-kickoff light halfway between the electrical connector and controller. On the end of the wire that goes into the controller, install a crimp or wire nut at the terminate, tape it up, and tuck information technology away - this wire is no longer existence used.

• Crimp roughly 12 inches of wire to remaining blue wire and install a ring last on the other finish. Plug the wire connector into the matching connector in the wiring harness, then install the other cease to the terminal on the glow plug relay that you removed the white wire from - this volition allow for your wait-to-start light to illuminate while the glow plugs are being manually cycled.

• Run a wire from your momentary button switch (practise not use a toggle switch or switch that remains activated after your permit go) to the terminal on the relay that you removed the white wire from (where the blueish wire should also be installed).

• Run the other leg of the momentary push button switch to a adept footing (preferably to the frame or engine block).

How the Transmission Glow Plug Switch Works

To wheel the glow plugs, plough the key to the "run" position and so hold down the transmission glow plug switch for 7-10 seconds, then release and start the engine. Do not wheel the glow plugs for more than 15 seconds at a time . If the glow plugs need to be cycled again, await 5 seconds and repeat equally necessary.

The modification works because it controls the ground for the glow plug relay (which receives power anytime the cardinal is in the on position, simply the glow plug controller normally switches the ground). When the button is held down, it completes the excursion and activates the glow plug relay, bypassing the controller and supplying power to the glow plugs for nonetheless long the push button is depressed.

1986 Ford F250 Manual Glow Plug Switch Installation Wiring Diagram

Source: https://www.dieselhub.com/maintenance/idi-manual-glow-plug-switch.html