Trailer wiring harness - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71MUTT · 01-24-2007, 01:25 PM

I have one hooked up, but haven't used it for quite awhile. Hooked a multimeter to it (don't have a trailer handy) and it shows 4 volts when the lights are on and 4 volts each time the light blinks.(4 prong plug testing each prong) Are 4 volts correct or should it read closer to 12 volts.

cdowns · 01-24-2007, 01:33 PM

shouild be 12v at least

71MUTT · 01-24-2007, 01:38 PM

Thanks. I guess I should buy a new one and rewire. It's probably corroded at the clamp splice that was put on years ago.

cdowns · 01-24-2007, 01:47 PM

those suck// they have plugin harness adatptors that you just plug in at the harness disconnect ifor the taillights just in front of the drivers side rear wheel// i think a trailer or boat supply store could get one for you

71MUTT · 01-24-2007, 02:05 PM

Ya, I was reading about them with the search function earlier. There was a Napa part number listed. I didn't quite understand how they worked, but with your explaination of the plug it has become clear.

Thanks again, I'll check it out.

71MUTT · 01-24-2007, 02:14 PM

Okay, I was looking under the truck and I see where the harness has a plug going through the frame. So the adaptor goes here? Any trick to unplugging this? Just pull apart? Thanks.

BCOWANWHEELS · 01-24-2007, 02:41 PM

check your ground ........

71MUTT · 01-24-2007, 02:55 PM

I have all my tail light housings grounded to the truck with a seperate wire. I used the same ground that I use for this. When I tested the prongs I used the truck and the ground prong with the same results. Thanks, I will check the ground wires out when I get home.

71MUTT · 01-24-2007, 04:28 PM

Just got back from Napa. This adaptor is so cool. They changed the part number to BK7551554. $7.49

Thanks to this discussion and all the others I found in the search.

01-24-2007, 01:25 PM	#1
71MUTT Can't ReMember Join Date: Dec 2006 Location: Orlando area Posts: 258	Trailer wiring harness I have one hooked up, but haven't used it for quite awhile. Hooked a multimeter to it (don't have a trailer handy) and it shows 4 volts when the lights are on and 4 volts each time the light blinks.(4 prong plug testing each prong) Are 4 volts correct or should it read closer to 12 volts. __________________ Adversity doesn't test your character; it reveals it. 71 C-10 LWB 350/TH350. I purchased it in 1978 for $1400. I'm currently abusing it daily. (when it's running )

01-24-2007, 01:33 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Trailer wiring harness shouild be 12v at least __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

01-24-2007, 01:38 PM	#3
71MUTT Can't ReMember Join Date: Dec 2006 Location: Orlando area Posts: 258	Re: Trailer wiring harness Thanks. I guess I should buy a new one and rewire. It's probably corroded at the clamp splice that was put on years ago. __________________ Adversity doesn't test your character; it reveals it. 71 C-10 LWB 350/TH350. I purchased it in 1978 for $1400. I'm currently abusing it daily. (when it's running )

01-24-2007, 01:47 PM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Trailer wiring harness those suck// they have plugin harness adatptors that you just plug in at the harness disconnect ifor the taillights just in front of the drivers side rear wheel// i think a trailer or boat supply store could get one for you __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

01-24-2007, 02:05 PM	#5
71MUTT Can't ReMember Join Date: Dec 2006 Location: Orlando area Posts: 258	Re: Trailer wiring harness Ya, I was reading about them with the search function earlier. There was a Napa part number listed. I didn't quite understand how they worked, but with your explaination of the plug it has become clear. Thanks again, I'll check it out. __________________ Adversity doesn't test your character; it reveals it. 71 C-10 LWB 350/TH350. I purchased it in 1978 for $1400. I'm currently abusing it daily. (when it's running )

01-24-2007, 02:14 PM	#6
71MUTT Can't ReMember Join Date: Dec 2006 Location: Orlando area Posts: 258	Re: Trailer wiring harness Okay, I was looking under the truck and I see where the harness has a plug going through the frame. So the adaptor goes here? Any trick to unplugging this? Just pull apart? Thanks. __________________ Adversity doesn't test your character; it reveals it. 71 C-10 LWB 350/TH350. I purchased it in 1978 for $1400. I'm currently abusing it daily. (when it's running )

01-24-2007, 02:41 PM	#7
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: Trailer wiring harness check your ground ........

01-24-2007, 02:55 PM	#8
71MUTT Can't ReMember Join Date: Dec 2006 Location: Orlando area Posts: 258	Re: Trailer wiring harness I have all my tail light housings grounded to the truck with a seperate wire. I used the same ground that I use for this. When I tested the prongs I used the truck and the ground prong with the same results. Thanks, I will check the ground wires out when I get home. __________________ Adversity doesn't test your character; it reveals it. 71 C-10 LWB 350/TH350. I purchased it in 1978 for $1400. I'm currently abusing it daily. (when it's running )

01-24-2007, 04:28 PM	#9
71MUTT Can't ReMember Join Date: Dec 2006 Location: Orlando area Posts: 258	Re: Trailer wiring harness Just got back from Napa. This adaptor is so cool. They changed the part number to BK7551554. $7.49 Thanks to this discussion and all the others I found in the search. Attached Images __________________ Adversity doesn't test your character; it reveals it. 71 C-10 LWB 350/TH350. I purchased it in 1978 for $1400. I'm currently abusing it daily. (when it's running )

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