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Old Bastard !
Joined: Fri Dec 22nd, 2017
Location: California USA
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I am sure you have been thinking on your methods of wiring, which switch to use, grounded or positive switching, but I am as I am and I need to keep talking about something I find interesting.
This circuit only requires a ground circuit, similar to the doors, one wire from a run power source, to a dash mounted indicator light, and then to a waterproof switch at the tailgate; the switch will ground out the circuit when the engine is running and the tailgate is open.
As you stated the Door Ajar circuit is a good idea to connect the tailgate to but I think a more direct circuit will be better for reliability. The Door Circuit always find some reason to stay on and that would give a false reading, giving way to ignoring the flashing light on the dash.
Only problem is the Switch, there are plenty of Door Activated Type Switches, BUT waterproof ones appear hard to locate, at least for me, but I'm working on it.
The idea can be brought to fruition simply by a one wire circuit, and a Waterproof Switch !
Great idea, thanks, I've added to my To-Do List !
p.s. Also found out that the company "Zoro" where I buy a lot of the Piping for Shelving, has Switches and a lot of other electrical components... China Made though, but no waterproof switches so far !
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Ltr,
2003 EDGE, Std Cab, Steppie, E4 Red, 5sp, 4x
5" SuperLift, 33" x 12.50 x 15"
Hurst Shifter
Mod'd Backrack to fit Steppie
Front and Rear Bumpers by Custom 4x4 Fabrication, OK; now Mike's Welding and Fabrication.
Working on more Mods, just need more time, longer days would work !