Re: Trailer wiring
[Re: FurryStump]
#3228282
04/20/24 01:55 PM
04/20/24 01:55 PM
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Joined: Mar 2003
Posts: 1,462 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,462
Martinsville, IN
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I also did that but remember the turn and brake filament are the same. Your diagram reminded me of that once I actually sat and saw it drawn out. Thanks again
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Re: Trailer wiring
[Re: Cab_Burge]
#3228288
04/20/24 02:12 PM
04/20/24 02:12 PM
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Joined: Sep 2003
Posts: 19,479 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,479
north of coder
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just went through a similar situation with my buddy's 54 chevy custom. it is using 6, 59 cadillac bullet tail lights, [three on each side, frenched into the fenders.] as he is using the original 54 turn signal switch and wires, he added relays at the tail lights because he figured the multiple tail lights would be an excessive load on the original turn signal and brake light switches. adding a relay to each bank of rear lights, every imaginal wiring combination of the relays would not make the rear lights function as they should. he would get brake lights on one side only, turn signals that would work one side or the other, but not both, or act as 4 ways, and other goofy combinations of both side rear lights. i investigated his wiring, and it "seemed" the relays were wired correctly, and i even tried a couple of different ways to wire the relays, including using the ground to activate them. nothing worked. these were good quality bosch OEM relays. sometimes, the relays would just "hum", and the lights would do nothing. so just for grins, a pair of 1157 sockets were wired into the rear light harness in series with the caddy tail lights, and now the lights work as they should ! it seems there wasn't enough draw through the relays to trigger the flashers used in the turn signal and 4 way circuits through the original turn signal switch. adding the extra 1157 bulbs in the tail light circuit[s] brought enough draw to allow the turn signals to work correctly, as well as the brake lights. [even though conventional wisdom would say using the three 1157 bulbs on each rear light circuit should be enough draw to trigger the flasher] i have never ran into this before, but am tossing this out there for others to learn from, if having troubles in this area. there are no issues with excess heat in either the tail light wiring, or the relay wiring. he is going to mount these extra bulbs and sockets behind the upholstery side panels in the trunk, close to the 1/4 panels on the rear of the wheel tubs. i couldn't believe how this problem needed to be fixed, but i wrote it down for future use. ![beer beer](/ubbthreads/images/graemlins/custom/beer.gif)
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Re: Trailer wiring
[Re: moparx]
#3228332
04/20/24 07:58 PM
04/20/24 07:58 PM
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Joined: Mar 2003
Posts: 1,462 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,462
Martinsville, IN
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just went through a similar situation with my buddy's 54 chevy custom. it is using 6, 59 cadillac bullet tail lights, [three on each side, frenched into the fenders.] as he is using the original 54 turn signal switch and wires, he added relays at the tail lights because he figured the multiple tail lights would be an excessive load on the original turn signal and brake light switches. adding a relay to each bank of rear lights, every imaginal wiring combination of the relays would not make the rear lights function as they should. he would get brake lights on one side only, turn signals that would work one side or the other, but not both, or act as 4 ways, and other goofy combinations of both side rear lights. i investigated his wiring, and it "seemed" the relays were wired correctly, and i even tried a couple of different ways to wire the relays, including using the ground to activate them. nothing worked. these were good quality bosch OEM relays. sometimes, the relays would just "hum", and the lights would do nothing. so just for grins, a pair of 1157 sockets were wired into the rear light harness in series with the caddy tail lights, and now the lights work as they should ! it seems there wasn't enough draw through the relays to trigger the flashers used in the turn signal and 4 way circuits through the original turn signal switch. adding the extra 1157 bulbs in the tail light circuit[s] brought enough draw to allow the turn signals to work correctly, as well as the brake lights. [even though conventional wisdom would say using the three 1157 bulbs on each rear light circuit should be enough draw to trigger the flasher] i have never ran into this before, but am tossing this out there for others to learn from, if having troubles in this area. there are no issues with excess heat in either the tail light wiring, or the relay wiring. he is going to mount these extra bulbs and sockets behind the upholstery side panels in the trunk, close to the 1/4 panels on the rear of the wheel tubs. i couldn't believe how this problem needed to be fixed, but i wrote it down for future use. MoparX that is an interesting problem? Are his taillights LED?
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Re: Trailer wiring
[Re: moparx]
#3228413
04/21/24 01:52 PM
04/21/24 01:52 PM
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Joined: Dec 2005
Posts: 11,611 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,611
Fulton County, PA
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Run a relay for the running lights. Pick up the load from the battery or a battery junction. Use the running light circuit to turn the relay on. Mount it right by the battery and run a 10ga wire to the trailer plug.Takes that load off the switch.
I burned up probably 4 switches in my old dually before doing that.
If the results don't match the theory, change the theory.
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Re: Trailer wiring
[Re: cdwmotorsports]
#3228494
04/21/24 09:46 PM
04/21/24 09:46 PM
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Joined: Apr 2024
Posts: 1 Ohio
*unknown_user*
member
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member
Joined: Apr 2024
Posts: 1
Ohio
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No need to piece this together. Tekonsha trailer wiringI use the direct fit version of this box (plugs into the existing light harness without the sensing feature of this universal one) on my daily, works great.
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Re: Trailer wiring
[Re: *unknown_user*]
#3228674
04/22/24 11:13 PM
04/22/24 11:13 PM
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Joined: Mar 2003
Posts: 1,462 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,462
Martinsville, IN
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No need to piece this together. Tekonsha trailer wiringI use the direct fit version of this box (plugs into the existing light harness without the sensing feature of this universal one) on my daily, works great. Bosch brand relays are $4.99 a piece, I'm more than capable of handling this task. I'm not spending $170 on something I'll have less than $50 in and if a part of it goes bad I don't have to spend $170 to fix it.
Last edited by cdwmotorsports; 04/22/24 11:15 PM.
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Re: Trailer wiring
[Re: cdwmotorsports]
#3230168
04/30/24 10:30 AM
04/30/24 10:30 AM
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Joined: Mar 2003
Posts: 1,462 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,462
Martinsville, IN
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Alright so for those doing this on an A-body I had the following "problems" the 52 year old flashers won't work so don't try. Go get electronic flashers before starting. Aside from that i had no problems from the car side of things. I did forget to wire in the trailer plug and had to go back and do that again but that's on me. I'll post a couple pics and videos later.
Also running lights are black, DS turn is green and PS turn is brown.
Last edited by cdwmotorsports; 04/30/24 10:32 AM.
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Re: Trailer wiring
[Re: cdwmotorsports]
#3230370
04/30/24 11:11 PM
04/30/24 11:11 PM
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Joined: Mar 2003
Posts: 1,462 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,462
Martinsville, IN
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Alright all well the electronic flasher didn't solve the no rear hazards issue. Does anyone know if there is a sperate wire for hazards on the 72 A-body?
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Re: Trailer wiring
[Re: cdwmotorsports]
#3230803
05/03/24 10:55 AM
05/03/24 10:55 AM
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Joined: Sep 2003
Posts: 19,479 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,479
north of coder
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Check the steering column wiring harness and that switch Fun fact if you wiggle the hazard switch that hasn’t been used in who knows how long the rear hazards will work. by rear hazards, do you mean on the car or trailer, or both ? how many connections/connector points have you checked, and what were the results ? [i may have missed some you may have posted] perseverance will solve a problem every time, even though you will, or may not, have any hair left on the top of your head. [like me. ![biggrin biggrin](/ubbthreads/images/graemlins/custom/biggrin.gif) ] ![beer beer](/ubbthreads/images/graemlins/custom/beer.gif)
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Re: Trailer wiring
[Re: moparx]
#3233077
05/15/24 10:18 PM
05/15/24 10:18 PM
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Joined: Mar 2003
Posts: 1,462 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,462
Martinsville, IN
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Check the steering column wiring harness and that switch Fun fact if you wiggle the hazard switch that hasn’t been used in who knows how long the rear hazards will work. by rear hazards, do you mean on the car or trailer, or both ? how many connections/connector points have you checked, and what were the results ? [i may have missed some you may have posted] perseverance will solve a problem every time, even though you will, or may not, have any hair left on the top of your head. [like me. ![biggrin biggrin](/ubbthreads/images/graemlins/custom/biggrin.gif) ] Well with the way I have it wired it was both the car and the trailer. I wiggled the hazard switch around and they started working so my presumption is the switch had/has a bit of corrosion in it.
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Re: Trailer wiring
[Re: cdwmotorsports]
#3233100
05/16/24 01:44 AM
05/16/24 01:44 AM
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Joined: Aug 2003
Posts: 43,228 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,228
Bend,OR USA
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Check the steering column wiring harness and that switch Fun fact if you wiggle the hazard switch that hasn’t been used in who knows how long the rear hazards will work. by rear hazards, do you mean on the car or trailer, or both ? how many connections/connector points have you checked, and what were the results ? [i may have missed some you may have posted] perseverance will solve a problem every time, even though you will, or may not, have any hair left on the top of your head. [like me. ![biggrin biggrin](/ubbthreads/images/graemlins/custom/biggrin.gif) ] Well with the way I have it wired it was both the car and the trailer. I wiggled the hazard switch around and they started working so my presumption is the switch had/has a bit of corrosion in it. ![iagree iagree](/ubbthreads/images/graemlins/custom/iagree.gif) ![bow bow](/ubbthreads/images/graemlins/custom/bow.gif)
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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