Trailer Wiring Harness

cormudgen · 07-01-2008, 10:05 AM

Hello,

I have an 08 access cab pre runner that didn't come with the tow package. I purchased a hitch and wiring harness from Uhaul for a total of $150 and have installed the hitch.

The wiring harness is not a plug and play and has 5 wires.

White-ground to chasis

Green-Left turn signal
Red-stoplight
Yellow-Left turn signal
brown-tailight

I am wondeing where is the best place to splice the Green, Red, Yellow, and Brown and if anyone knows the color of the wires that they need to be spliced into. I have located wiring that is right near the spare tire that runs to both tailights as well as the licesne plate lights. This seems like the easiest place to splice into.

Does anyone have a mapping of the colors for those 4 listed?

Thanks ahead for all help.

Rtrn2taco · 07-01-2008, 10:21 AM

Behind the tail lights is the best place to make the splices, there is less chance for the elements to corrode them. Remove taillights using a 10mm socket and route wires up thrue the bottom.

Wires - after pulling the taillights it will become obvious what wires to use. for instance the left turn signal will have two wires running to the top bulb white being the ground and the other being the turn signal wire (same for passenger). for the brake and parking lamps, the brake light wire is the green with red trace and the parking is the green wire running to the center bulb.

This is from memory although I believe it is accurate.

lsocoee · 07-01-2008, 10:52 AM

keep in mind that you do not have the tow package and your towing capacity is probably going to be lower than the stock towing package. You're missing out on a different alternator, battery, transmission cooler, and an oil cooler.

cormudgen · 07-01-2008, 12:12 PM

I'm not concerned about towing with out the package as I won't be pulling much weigh, and will rarely be doing so.

I wanted to splice in under the truck as it seemd it would be pain to go from both extreme sides of the truck to the center. Also it seems it will be harder to run the wires with a "clean" look routing them out of the tail lights.

maverick491 · 07-01-2008, 06:24 PM

Just buy this.

The hoppy connector makes it plug and play simple, and costs less than 50 bucks. You'll have no splices under the truck or behind the tail lights to corrode and short out, and you'll be done in less than 10 minutes. Then go return the harness to u-haul for a refund.

This and much more is covered in the tacoma towing bible which is stickied at the top of the towing section.

phantom · 07-01-2008, 06:44 PM

Quote:

Originally Posted by maverick491

Just buy this.

+ 1

cormudgen · 07-02-2008, 07:23 AM

trust me i would love too.

however, i waited to long and will be making a move (14 hour drive) before that part would come in.

cormudgen · 07-02-2008, 01:56 PM

well i quit being lazy and went out there with a test light

for future reference

BLUE/YELLOW = Left turn
BLUE/BLACK = Right turn
BLUE (SOLID) = Brake
Green = Tail lights

I tied into all but the left turn right before where they all meet to go to the front in one wire loom. The left turn I did just up higher near the light, b/c I didn't realize I hadn't gone to the point where they all meet yet. There are actually three solid greens at this point, you will need to follow the one that goes to the liscense plate lights to make sure you get the "constant light one".

Hope this helps someone down the road.

07-01-2008, 10:05 AM	#1
cormudgen Junior Member Joined: Jul 2008, #7674 Posts: 5	Trailer Wiring Harness Hello, I have an 08 access cab pre runner that didn't come with the tow package. I purchased a hitch and wiring harness from Uhaul for a total of $150 and have installed the hitch. The wiring harness is not a plug and play and has 5 wires. White-ground to chasis Green-Left turn signal Red-stoplight Yellow-Left turn signal brown-tailight I am wondeing where is the best place to splice the Green, Red, Yellow, and Brown and if anyone knows the color of the wires that they need to be spliced into. I have located wiring that is right near the spare tire that runs to both tailights as well as the licesne plate lights. This seems like the easiest place to splice into. Does anyone have a mapping of the colors for those 4 listed? Thanks ahead for all help.

07-01-2008, 10:52 AM	#3
lsocoee I'm not an ambi-turner. Joined: Feb 2007, #872 Location: Metairie, LA Age: 27 Posts: 4,820 2007 PreRunner SR5 Double Cab Long B 2007 Double Cab Automatic V-6 Bed mat, URD CAI, URD MAF Calibrator, C2C Hood Struts, Wet Okole Seat Covers, Pop-n-Lok, Wet Okole Underwear	keep in mind that you do not have the tow package and your towing capacity is probably going to be lower than the stock towing package. You're missing out on a different alternator, battery, transmission cooler, and an oil cooler. __________________ Tacoma World: One big happily dysfunctional family.

07-01-2008, 06:24 PM	#5
maverick491 Carolina Alliance: Historian Joined: Apr 2007, #1462 Location: South Jersey Posts: 983 07 4x4 Access Cab, TRD off road, 6 cyl, 6 spd 2007 Access Cab Manual 4.0L V6 Activator III brake controller, Extang Fulltilt toneau, Factory bed mat, Extra D-rings in the bed, 2ndary air filter removed, Garmin Ique GPS, Eco-2, AFE Pro Dry-s filter, USASPEC PA12-toy, Pioneer 3-way speakers, SG II on Blendmount, Gulf States Alarm added.	Just buy this. The hoppy connector makes it plug and play simple, and costs less than 50 bucks. You'll have no splices under the truck or behind the tail lights to corrode and short out, and you'll be done in less than 10 minutes. Then go return the harness to u-haul for a refund. This and much more is covered in the tacoma towing bible which is stickied at the top of the towing section. __________________ Maverick491 (Adam) DIY MODS Activator III brake controller Extra D-rings Aftermarket speakers w/TacoTunes mounting kit Illuminated 4wd switch ECO-2 VPE Scangauge II/Blendmount

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Wiring harness for rear lights on'07	pmo	2nd Gen. Tacomas	6	07-01-2008 10:07 AM
Replacing damaged 7pin trailer harness	kristopherl	2nd Gen. Tacomas	7	05-05-2008 08:16 PM
Wiring Harness	TacomaYAK	Audio & Video	9	02-25-2008 12:00 AM
tow package wiring harness	jsb	Towing	8	02-04-2008 03:14 PM
Wiring Harness	777 Taco	Technical Chat	5	11-07-2007 07:05 PM

07-01-2008, 10:21 AM	#2
Rtrn2taco Senior Member Joined: Apr 2008, #6090 Location: Philadelphia Posts: 107 08 PreRunner silver 2008 Double Cab Automatic	Behind the tail lights is the best place to make the splices, there is less chance for the elements to corrode them. Remove taillights using a 10mm socket and route wires up thrue the bottom. Wires - after pulling the taillights it will become obvious what wires to use. for instance the left turn signal will have two wires running to the top bulb white being the ground and the other being the turn signal wire (same for passenger). for the brake and parking lamps, the brake light wire is the green with red trace and the parking is the green wire running to the center bulb. This is from memory although I believe it is accurate.

07-01-2008, 12:12 PM	#4
cormudgen Junior Member Joined: Jul 2008, #7674 Posts: 5	I'm not concerned about towing with out the package as I won't be pulling much weigh, and will rarely be doing so. I wanted to splice in under the truck as it seemd it would be pain to go from both extreme sides of the truck to the center. Also it seems it will be harder to run the wires with a "clean" look routing them out of the tail lights.

07-02-2008, 07:23 AM	#7
cormudgen Junior Member Joined: Jul 2008, #7674 Posts: 5	trust me i would love too. however, i waited to long and will be making a move (14 hour drive) before that part would come in.

07-02-2008, 01:56 PM	#8
cormudgen Junior Member Joined: Jul 2008, #7674 Posts: 5	well i quit being lazy and went out there with a test light for future reference BLUE/YELLOW = Left turn BLUE/BLACK = Right turn BLUE (SOLID) = Brake Green = Tail lights I tied into all but the left turn right before where they all meet to go to the front in one wire loom. The left turn I did just up higher near the light, b/c I didn't realize I hadn't gone to the point where they all meet yet. There are actually three solid greens at this point, you will need to follow the one that goes to the liscense plate lights to make sure you get the "constant light one". Hope this helps someone down the road.