I am trying to wire auxilary lighs inthe rear of my truck but I cant find a harness that is 18 feet long. Can I combine two?

I am trying to wire auxiliary lights in the rear of my truck but I cant find a harness that is 18 feet long. Can I combine two that are 9 feet long and use them to extend the reach? I know how to wire everything just don't know if you can use two harnesses. Thanks!
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hi there. In theory, as long as you connect the two harnesses together correctly, that should work. It might be better to run straight wires from the accessory switch to the component you’re powering or consult with the aftermarket light manufacturer to see if they have a solution for you.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

2006 Ford F-150: Fuel Pump Failure

Ford`s 5.4L V8 engine has also had some ongoing issues with its fuel pumps, particularly in the 2006 Ford F-150. One complaint on the NHTSA page was filed in 2017 and reports that the fuel pump control module became corroded, causing the engine on the truck to stall completely.

Air control valve of a Ford F 150 on acceleration will need to be replaced, as well as a faulty clutch . Your car will jerk on acceleration due to plugs and wires issues. Misdirected spark plugs or faulty coil packs may also cause the truck to jerk on acceleration, as well as an engine problem.
The total weight a Ford F-150 can hold in its bed ranges from 1,410 lbs to 3,250 lbs (640 kg to 1474 kg). Your truck`s max capacity depends on various factors, including the engine, bed size, and drivetrain.
Driving the Used 2007 Ford F150

The Triton 5.4-liter V8 features a three-valve-per-cylinder design and variable cam timing to generate 300 horsepower and a healthy 365 pound-feet of torque.

Most of the most common problems developed with the 2004-2013 3 valve engine but some problems spanned all engine generations. The most popular issue but easiest to fix, is the ignition system. The 3 valve 5.4L Triton contains a coil-on-plug design.
Fuel injectors may become dirty over time and not be able to provide as much fuel to the cylinder as is needed. Dirty fuel injectors may cause the engine to run lean which will in turn, cause hesitation when accelerating.
There are a range of reasons why your car is juddering when you accelerate. Your vehicle could have dirty fuel injectors, a damaged fuel pump, a blocked catalytic converter, a faulty mass airflow sensor, broken spark plugs, or even an accumulation of moisture.
4,069–4,653 lb (1,846–2,111 kg), regular cab.
The 2021 F-150 features six potent engine options to satisfy your preferences around power, performance, and fuel efficiency. Experience best-in-class strength* with up to 14,000 pounds of maximum towing ability and 3,325 pounds of maximum payload capacity.
The first generation 5.4L, produced from 1997 to 2004, has two valves per cylinder. It is relatively reliable, with only two major faults: excessive timing chain stretch, and spark plugs sometimes blowing out of the cylinder head.
Lasting over 300,000 miles, 2006 is a good year for the F-150 with only minor spark plug issues reported. It`s an affordable half-ton truck, valued at $5,778 – 11,757. Towing performance is remarkably good, the interior materials are high quality and the ride is smooth.
The average rating is a 4.3 out of 5 stars. The 2006 Ford F-150 Reliability Rating is 3.5 out of 5. It ranks 21st out of 32 for all car brands.
Top Speed: 116+ Miles Per Hour

The F-150 Venom 775, as its name suggests, produces 775 horsepower from a 5.0-liter Coyote V8 with a 2.9-liter high-flow supercharger affixed. This truck will hit 60 miles per hour in 4.0 seconds flat and conquer the quarter-mile in just 12.1 seconds at 116 miles per hour.

The Triton is a 5.4-liter naturally aspirated V8 engine from Ford Motor used to power full-size trucks and sport utility vehicles like the Ford F-150, Ford Expedition and Lincoln Navigator.
TOM: For those who have Ford trucks from this era, the offending engines are the 3-valve 5.4-liter from 2004 to 2007, the 3-valve 4.6-liter from 2005 to 2007, and the 3-valve 6.8-liter from 2005 to 2007.
One service issue technicians should be on the look out for is late-model Ford trucks (1997 to 2004 Ford F-Series, Expeditions and Excursions) that are reportedly blowing out spark plugs. The problem seems to occur most often on 5.4L Triton engines, but may also occur on other V6, V8 and V10 engines in these vehicles.
The earlier engines didn`t seem to have as many issues, nor do the ones produced after 2013. Despite all this, the Ford 5.4 is a a very solid engine. Even the ones produced from 2004 through 2013, if you compare them with other engines from that same time period.
The first generation 5.4L, produced from 1997 to 2004, has two valves per cylinder. It is relatively reliable, with only two major faults: excessive timing chain stretch, and spark plugs sometimes blowing out of the cylinder head.
Overall, the 2V Triton V8 is seen as a reliable engine. But this is not an American-made engine; production was actually done north of the border in Canada. By 2003, Ford moved to a 3-valve setup in the F-150 full-size truck. And unfortunately, without proper maintenance, that engine is known to have some problems.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

I am trying to wire auxilary lighs inthe rear of my truck but I cant find a harness that is 18 feet long. Can I combine two?
ANSWER : Hi there. In theory, as long as you connect the two harnesses together correctly, that should work. It might be better to run straight wires from the accessory switch to the component you’re powering or consult with the aftermarket light manufacturer to see if they have a solution for you.

I parked my truck for 5-10 mins. Tried to turn it on, now it wont start, called a tow tow truck 15-20mins later my truck turned on
ANSWER : It is very likely that you have a powertrain control module failure. This can happen often on many GM vehicles. I would recommend having the powertrain control module tested and replaced as necessary in order to resolve this issue. After the powertrain control module is replaced, a reflash procedure will be required so that the vehicle can relearn all of its primary engine data. Once the reflash is completed, your vehicle should no longer have this issue.

I have a 2016 kia forte. A rodent ruined my wiring harnesses causing safety and operational issues. Kia says the harnesses have to
ANSWER : Hi there. The automotive manufacturer is 100% correct in their estimation about splicing a wiring harness. Today’s vehicles are 100% controlled and monitored by electrical and computer operated systems. These systems require a clear and unaltered wiring system that sends electrical signals from sensors and components to the ECU and back. Splicing or altering the wiring in any way is very unsafe and can disable several safety systems including air bags, anti-lock brakes and other systems.

How can I find the correct chassis wiring harness for my truck?
ANSWER : The harnesses are referred to in GM parts catalogs as "body wiring" and "rear lamp wiring". However, the correct wiring harness for your vehicle can only be found via a VIN number search in the catalog. It can’t be searched simply by "model" due to the large number of vehicle variants, for example RPO codes. There is no way to look up a harness part number without your VIN number so please send it. Unfortunately, many of the wiring harnesses, including many within the two "categories" you are inquiring about are discontinued by GM. Inasmuch as some are available it is still worth looking up and confirming whether you can get it or not, but you may be in a situation where you have to fabricate your own replacement harness which is not a big deal particularly if you have the old one available to use as a template. The biggest issue are the cable terminations but many of those may be standard and thus pigtails will be available. You could actually make a better (higher quality) harness than that originally used on the vehicle. Please let us know how we can assist you further.

Cant find brake fitting for 1/4 line going into rear rubber line with tee.
ANSWER : Your best bet would be to have a professional perform the service for you since you are having so much trouble. These are the brake lines so you really want them done right the first time and a warranty in case something goes wrong and your pedal gets soft. The old fitting will need to be cut from the old line and placed on the new line and the new line flared as the vehicle is set up which may require that expensive tool. Consider hiring an experienced technician like one from YourMechanic who can help you avoid a tow fee and come out to take a closer look at the brake system damage to offer a more personal estimate on the repairs.

How do I know I have two resonators? Can I have two mufflers in each side with one resonator? Which side is most important? Thank You.
ANSWER : You may have a single small resonator in the middle of the car that splits to the two mufflers. One on each side with single or dual tip outlets. The two mufflers are equal to each other to exit the exhaust flow. For more concrete advice, I’d recommend having an expert technician check out your specific muffler situation in person. A technician from YourMechanic can come to your home or office inspect your exhaust system and assist with any repairs that are needed.

I need to know which body wiring harness goes to my truck- VIN lookup
ANSWER : My best recommendation would be to contact your local dealership. If you give them your year, make, model, vin, and a description of the wiring harness that you need, they should be able to give you some information in regards to the part number. Unfortunately, the dealership is about the only possible chance of tracking down this harness other than getting one from a junk yard.

Window wiring harness broke
ANSWER : Hi there. I’m assuming the connector on the wire harness is broken and now one of the wires has broken. One of the things you could do is locate another matching truck in a junkyard or being parted out and retrieve the window switch harness pigtail. Cut the harness well below the connector so that you have plenty of wire to work with. You could then attach the newer pig tail, matching the wires, and connect it to the window switch. Wire cutters, solder, soldering iron, heat shrink tubing, and some black electrical tap should do the trick; use the tape to wrap the newly connected pigtail at the new connection. If the switch is broken at the connector, simply replace the switch with a new or known working used one. Performing a proper electrical connection can be a daunting task; I suggest having a qualified technician perform an inspection to determine what all needs to be corrected to avoid replacing unnecessary parts and complete the electrical connection properly for trouble free repair. Your Mechanic has several available technicians that can assist you with an electrical problems inspection.