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Have search both the forum and the web and haven't been able to find any good diagrams or explanations so I thought I'd ask the greater minds of FTE.
91' Bronco Full-size w/351w and E4OD.
I'm trying to figure out both the wiring harness to, and the function system of the Overdrive Cancel switch on the dash. Rig has cruise control but I never, have ever, used it and I'd like to incorporate the cycle switch into the On/Off buttons in the steering wheel so when I approach a hill and want to downshift I don't have to reach down by my knee to do so. The dash switch is a reset switch so when power is disconnected it resets to default on, and when you press it it lights the dash indicator, disabling the TC lock-up. Not sure if it is just triggering a relay, or if it Is a relay itself. 4 wires into the back of it. Any advice?
And I realize deleting cruise control isn't ideal from a resale point of view, but with how much I've put into and rebuilt on this Bronco, I will never be selling it unless I ever declare bankruptcy.
That switch is just a momentary contact on/off switch. When it's pressed it provides a ground to the PCM. The PCM then disables overdrive and turns the light in the switch on. There are no relays involved.
You could also replace the shift handle with a later model one that has the button and light on the handle.
Which that'd be as simple as finding one, and it's retained with a pin I believe, correct? Then those are a two wire connector to the shifter button I believe so I'd tap into the 12v power at the factory switch and the wire on the factory button that pulses 12v when the switch is depressed?
I figured it out, ended up ditching the cruise control and wiring the OD cycle switch to the On button on the steering wheel. Has proven extremely convenient being able to shift in and out of OD without having to lean forward towards the dash. Also wired a push button toggle into the door for a set of moose lights in my front end so when a car approaches I can instantly shut them down without leaning forward and fumbling for the dash switch. Next up is a remote start, remote door lock/unlock, and wiring the trunk release function into the rear window motor to lower the window.
Seats came out of an 05' F150 Lariat supercab. Downside is not being able to get into the rear as easily from the front doors but the modern look, modern amenities of heated/power/memory/leather seats greatly outweighs the inconvenience. And the color change to match the interior turned out rather classy and modern. Also with the addition of chrome LED license plate lights wired for footwell lighting, upgraded door/B-piller audio. Only thing left to change is the carpeting.
