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Thread: Electrical Work.
12-21-2012, 06:35 PM #1
Ok, today I spent many hours working on the truck fixing some wiring I messed up. Well it is all good now, but I need some diodes to protect the system from backward feeding power. Does any one know what I should use?
I'm protecting my back up light from back feeding in to the reverse circuit and the reverse lights. The light is a 55w utility light, that is activated either by the reverse circuit via a relay or by a switch on the dash. I need to make sure that when the switch is activated it doesn't back feed to the reverse circuit.
Other work I did today was install new bulbs in the climate controls
1996 Chevy Tahoe LT 5.7L V8 4X4 199,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.
Check out my other mods in My Garage: http://www.gmtruckclub.com/forum/sho...t-Tahoe-4-Door
12-21-2012, 09:54 PM #2
If you go the relay route activated by the reverse/backup lights then no problems. If your back-up lights are activated by a switch on the transmision or the shift lever then you should have no problems with any back feeding issues when using a seperate switch. If activated by the body control module then maybe a blocking diode would be wise but not sure it would be neccessary. The only thing in my wiring diagram(99-06) is the automatic mirror adjust that would be activated by putting power to the back-up lamps.2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear
12-21-2012, 09:55 PM #3
The relay should do the job for you if you have it wired correctly, no diode required.
JammerMinneapolis area - 1997 K2500 regular cab long bed, pushes plow in the winter, carries camper in the summer - 2004 4x4 Suburban 2500 8.1, pulls 30' Airstream trailer
12-21-2012, 09:59 PM #4
So you are saying I should not have a problem because the relay is protecting the reverse circuit.
12-21-2012, 10:01 PM #5
Yep. Unless you wired the switch to the relay coil, instead of in parallel with the contacts. In that case you need two relays. It's no big deal -- if you have a problem you'll see the reverse lights come on with the work lights when you use the switch, no damage done, just a nuisance problem.
12-22-2012, 09:55 AM #6
I was just looking for confirmation before I finished the wiring tomorrow. All I need to do is wire the switch to the light. Currently the light is only controlled my the reverse circuit.
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Where does the orange wire for the trailer harness go to get power? I cant find it on any wiring diagrams, and there's about 20 orange wires that run to the dash and fuse box.
12-22-2012, 01:33 PM #7
2004 GMC Sierra 1500 5.3L V8 4x4 SLT Extended Cab Long Bed
(Garage Link: http://www.gmtruckclub.com/forum/sho...MC-Sierra-1500)
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12-22-2012, 02:31 PM #8
12-23-2012, 09:52 AM #9
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:: shrug ::
That will work. The diode doesn't accomplish anything though, in this situation.
12-23-2012, 10:09 AM #10
I may be going with a different relay set up where it actually does something. I will run both the switch and the reverse circuit to the 86 terminal with both the switch and circuit protected by a diode. The switch will draw power from the aux fuse box under the hood.
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