Troubleshooting 2008 Toyota Sienna With Trailer Running Lights Not Working

Question

Question:

My boat trailer had a short in the wiring which caused a fuse to blow in my pick up truck and also in my 2008 Toyota Sienna. When I tow the trailer with my Toyota the turn signals and brake lights work but the tail lights on the trailer do not. Is there a fuse that can be replaced within the wiring harness itself? There is not a separate fuse for trailer lights according to the owners manual in the Toyota like there is on my truck so I dont know which fuse would have blow in the Toyota. Any insight?

asked by: Marc S

0

Expert Reply:

There is not a separate fuse in the wiring harness itself. Normally for the functions like stop and turn to work but the running lights not to work is a bad ground wire connection on the vehicle or the trailer. Running lights stay on, so they draw more current than the other functions. Check the wiring harnes ground wire (normally white) where it attaches to the vehicle and make sure you have a clean metal to metal connection. Also check the trailer ground for the same. Any corrosion, rust, or paint could cause this issue, so clean it up and make sure there is solid metal to metal contact.

If you lights still don't work after that, use a tester like # PTW2993 to check the functions on your vehicle at the plug. If the running lights don't function there, I recommend replacing your wiring harness.

expert reply by: Jason S

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Answer 1

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 2

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 3

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion…

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Answer 4

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

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Answer 5

Lance does have a proprietary plug, but many customers see a standard 6-way or 7-way round and notice it doesn't fit their factory 7-way as well. I've attached an article to help if you have one of the 7-way or 6-way round connectors which we…

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Answer 6

Hey Richard, thanks for reaching out! The Dexter DX7.5 Drop-N-Go Brake Actuator #099-175-00 is a great option for a replacement actuator because it's a direct replacement for the common Model 60 actuators that were popular in the '90s.…

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Answer 7

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 8

Class I and Class II hitches both have a 1-1/4 inch receiver opening. The difference is that a Class I hitch has a lower tongue weight rating, usually 200 pounds and a lower towing rating, usually 2,000 pounds. A Class II hitch usually has a tongue…

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Answer 9

I definitely understand being a bit overwhelmed by the amount of options in front of you, however I can definitely help with differentiating the trailer hitches for your 2019 Subaru Outback Wagon along with explaining my personal recommendation,…

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Answer 10

Choosing the right height setting for your 5th wheel hitch is a combination of a few different variables. First of all you want your towing setup to be as level as possible. With your Montana High Country 340BH level you will want to measure from the…

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Answer 11

It could be a tow package fuse on the vehicle. Use the owners manual to find the locations of fuses/relays related to the tow package wiring to check them and replace as needed. If the issue is not a fuse or relay then you can test the vehicle side…

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Answer 12

The Tekonsha T-One #118304 and Curt T-Connector #C55580 Vehicle Wiring Harnesses are very similar. These are both custom fit wiring harnesses that include a tail light converter, which is required for your 2007 Toyota Sienna because the brake and…

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Troubleshooting 2008 Toyota Sienna With Trailer Running Lights Not Working

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