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Tractor Talk Discussion Forum

Truck wiring question

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NC Wayne

03-27-2007 17:51:52




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Just finished building a beavertail and drop gate for a buddy's '98 Isuzu NPR HD truck so he can use it for landscaping and am trying to get it wired up. I've run into something I've never seen before and am wondering how to wire it and more so how I can wire a "normal" trailer plug to it. Every system I've ever dealt with has the standard two filiment bulb with the running lights on the dim filiment and the signals/brake on the brighter one. In other words the brake signal is running in the same wire as the turn signal to the same bulb filiment, so if you have the brakes on and turn on the turn signal what happens is the turn signal overrides the brake signal to make the light flash and when you turn it off the brake still keeps the bright filiment lit. This truck isn't like that, it has three wires, a left turn, a right turn, and a brake wire, all independent of each other. I've checked the signal wires to see if the energize with the brake and they don't, and the brake wire doesn't energize with either signal wire, and if I hook the say the left signal and brake wire together all that happens is the front signal lights when you hit the brake and the signal doesn't cancel the brake. I know I can wire it with each wire independent and the brake going to light other than the one used for the signal but doing that doesn't help when I try to wire a trailer plug for a trailer that has standard two filament lights. Anybody know anything about this particular truck and the odd way it's wired and does anybody have any ideas what I need to do for the trailer plug. Even better does anybody have or know where I can get a wiring schematic for this truck since I've also got some more troubleshooting to do on it before it leaves the shop. Any and all views, ideas, tips, or whatever you can offer would be greatly appreciated.

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Leland

03-27-2007 21:58:17




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 Re: Truck wiring question in reply to NC Wayne, 03-27-2007 17:51:52  
hoppy makes a converter available at most walmarts under 15.00



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RodInNS

03-27-2007 19:21:42




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 Re: Truck wiring question in reply to NC Wayne, 03-27-2007 17:51:52  
Yes, you need the converter. I need one on my Ranger.... or I did. I've had 2 of them BURN on me now, and have no intention of having a third one burn. The tralier will be rewired to 7 pin.
You'd be well advised to carry a spare converter with you unless you luck into a better quality unit than I had. Actually, I think I had one fail outright, and two burn....

Rod



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george md

03-27-2007 18:56:46




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 Re: Truck wiring question in reply to NC Wayne, 03-27-2007 17:51:52  
Wayne,

Years ago all the tractor- trailers were wired like that . They all had tail , brake, and two turn signal wires as well as the marker light wire . The 7 pin plugs were labeled that way and not by color code. When the decimal point got in the way of good judgement ,they started using brake and turn on the same wire. I still wire my 40 ft equip-
ment trailer with separate wires , if a late model tractor hooks up to it ,it will work like the late model wiring .

george

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Armand Tatro

03-27-2007 18:46:35




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 Re: Truck wiring question in reply to NC Wayne, 03-27-2007 17:51:52  
I hope you are planing on using shock-mounted sealedbeam lights for brake/turn, tail, and clearance lights. My experance with my semi is that 1157"s and other bulbs with filaments will shake themselves to pieces. Armand



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dan67

03-27-2007 18:45:23




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 Re: Truck wiring question in reply to NC Wayne, 03-27-2007 17:51:52  
real common on inport trucks, get the converter and it will solve the problem.



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The Preacher

03-27-2007 17:59:08




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 Re: Truck wiring question in reply to NC Wayne, 03-27-2007 17:51:52  
I had a 94 Toyota truck that was the same way. There are basically two ways to do it. Either you can use a 5 or 6 wire plug for the trailer, and add two additional lights for stop lights, or you can get a light converter for the truck that will combine the turn signals and stop lights for the trailer. you can purchase this item at a local truck and trailer store, or look for an RV dealer/service shop. They will most likely have the converter, and they will probably help you with any questions. They're pretty simple to hook up, they wire in between the truck's wiring and the trailer plug.

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NC Wayne

03-27-2007 18:26:11




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 Re: Truck wiring question in reply to The Preacher, 03-27-2007 17:59:08  
Thanks. Never had the need for a converter like that so I didn't know they made them. I'll do some calling and checking tomorrow. Thanks again.



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