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Trailer wiring gurus

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mhankins View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mhankins Quote  Post ReplyReply Direct Link To This Post Topic: Trailer wiring gurus
    Posted: 05 Jan 2020 at 9:12am
I have a 2018 dodge journey, and installed a hitch the other day.
On the wiring it said if you have LED vehicle light,and standard lights on the trailer,you had to buy an adapter to protect the vehicle wiring.
 My question is,would putting diodes in line to the trailer do the same thing. ?
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Coke-in-MN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2020 at 10:21am
rsistance - LED do not have same resistance level as tungsten bulbs so flasher might not work right . 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DanWi Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2020 at 11:35am
Would the vehicle with LED's have lighter wiring then the trailer with standard bulbs? The trailer would require more amperage? That is the one thing when I have added LED's to a tractor the wires are like telephone wire.
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john(MI) View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote john(MI) Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2020 at 12:20pm
Originally posted by DanWi DanWi wrote:

Would the vehicle with LED's have lighter wiring then the trailer with standard bulbs? The trailer would require more amperage? That is the one thing when I have added LED's to a tractor the wires are like telephone wire.




Now that's just silly!  Telephones don't have wires they have batteries!LOLLOL
D14, D17, 5020, 612H, CASE 446
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Dnoym N. S. Can. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dnoym N. S. Can. Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2020 at 1:07pm
buy an adapter to protect the vehicle wiring.

wire in the vehicle is to small to carry the load

the adapter has to be hook up to your battery

you could fry your body computer or wire`s

with out the adapter


                hth      B:-)     Dnoym

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TMiller/NC View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TMiller/NC Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2020 at 1:13pm
Change trailer lights to led
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jaybmiller View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2020 at 2:07pm
buy a FORD !!!!Wink
Really the adapter is NOT needed, well shouldn't be, at least from BASIC AUTO electrical101.
All (most ?) LED lights for cars have to be 'CAN' compatible, which means they have a huge 'dummy' load resistor in parallel with the low current LED, so that the 'computer' won't falsely say 'burned out light' .
These days most( all ?) vehicles have a separate power feed( relays and fuses) to connect to trailer wiring. Not really neded( again, basic electrical...) but adds more stuff and keeps people in jobs....
Then , if you're truly paranoid just repalce the 'regular' 1157s with LED1157s...hmm they have CAN compatible loads so gues what.. SAME current draw as original 1157s..

scammers...



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DMiller View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 05 Jan 2020 at 3:16pm
Unless truck has a Separate Trailer supply circuit can destroy the truck side electrical, seen it happen recently. As noted Ford installs a SEPARATE Trailer side supply harness or at least used to in prevention of this. Is actually CANBUS compatible, 18 ga wiring.

Edited by DMiller - 05 Jan 2020 at 3:17pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote HD6GTOM Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 2020 at 1:25am
What ever you do--- do it right. I saw at least 2 of those towed into the dealership with fryd components. It aint a cheap fix
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 2020 at 8:18am
I have serious concerns that ANY 'booboo' when wiring up a trailer can 'take out' a vehicles wiring. Yeesh...there's NO reason it ain't bulletproofed. Miswiring, shorting,backfeed, whatever, NOTHING should be able to  harm the vehicle. CAN bus interface is supposed to be 'robust' and well, fuses are supposed to open when stressed....
In contrast, the remote energy control systems I designed 3 decades ago, worked 24/7 using solid wires over a 15 MILE distance. Even nearby lightning strikes didn't take out my panels so I KNOW ,first hand , that properly designed equipment CAN work reliably.
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mhankins View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mhankins Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 2020 at 8:50am
Thanks for the replies.
 The vehicle has led lights,but the trailer does not.I have been thinking about changing the trailer to led lights and will go ahead and do that anyhow,and as per all the advise will buy the adapter.
 I would like to take it apart and see what's inside anyhow,but would probably ruin itConfused.
 That's why I was wondering about the diodes,if it just stops the back feed when the lights go off,seems it would do the same thing.
 I'm just the kind of guy who likes to know how things work!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 2020 at 9:14am
Basic Electronics101...

a diode only allows current to flow one way...
an LED is a diode that only allows current to flow one way BUT you can see the electrons flowing.....

I have no idea what's inside  the 'magic protector box' but if it's just a diode, well, I say again and LED IS a diode.....
3 D-14s,A-C forklift, B-112
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Never burn your bridges, unless you can walk on water
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 06 Jan 2020 at 11:51am
Last one of these Protector boxes I saw was at the steel sales yard I Frequent, they sell them for mods to newer trucks to pull older trailers, is essentially a self contained relay package triggered off the truck circuits, minor load to truck harness, is directly connected to Hot source to feed the internal bus.
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