Hi Richard, I have to do some electrical work on my P5, and was just looking to see what tools you used for the bullet connectors. I'm not really planning to rewire the entire system and want to use as much of the stock harness as possible. depends on if the interior is out, dash is out, and wiring already removed. Make sure wires are routed as neatly as possible. Our wiring harnesses are brand-new and better than N.O.S. This is a  safeguard in case something’s wrong when you reconnect the battery. Start with a quality set of wire strippers. Pliers See all 28 photos. This completely customizable harness provides 10 fuses, two 40-amp relays (perfect for operating things like electric cooling fans or fuel injection harnesses), and two 20-amp relays for lights, fuel pump, or water pump. These come through the bulkhead just to the left of the heater matrix. Right side of bulkhead, behind right bonnet hinge. depends on if the interior is out, dash is out, and wiring already removed. Many thanks you in advance for your help. Wiring is a time consuming job that requires patience and detail in order to ensure success. In short, without a wiring harness, you can install your car stereo by directly connecting the wires of the radio. Make a final check that all wires of the new harness are connected, and it all looks correct. We didn’t use any Scotchloks on this install. Disconnect the lights in the wings – there are bullet connectors at the front right and left of the engine bay. Firstly, disconnect the battery Negative and Positive terminals in the boot, and remove the battery just to be sure no wires touch it. We filled the terminal rings with melted solder and then inserted the fine-strand wire and crimped it for a durable connection. One critical item that’s often overlooked in a race car project is the importance of the wiring installation and its quality. A novice builder should be able to complete a basic wire harness replacement in three to four days. On a piece of paper, create a simple sketch of your trailer like … With our Original Design Series™ wiring, you can either rewire the vehicle one harness at a time, rewire a specific area of the vehicle (for example, the engine compartment), or what we recommend, completely rewire the vehicle bumper-to-bumper by purchasing all the harnesses … There is typically an open contact when the relay is not energized (although some relays are in a closed stage at rest), but applying electrical current to the contacts will change their state. Once you’ve gone through each fuse and are happy everything works as expected, start adding the fuses again, but leave the previous fuse in-place. This includes all the dash kits and wiring harnesses you will need to properly install your new car stereo. This is admittedly the cheapest way you can wire a car. I just need an estimate on re-wiring it. Remove the main, bulkhead connection located on the firewall where the engine harness goes into the car to connect to the main computer. I have looked around for that tool but it £88 plus VAT. Start disconnecting the wires from the instruments, switches and warning / illumination lights, taking lots of photos. If your vehicle is not equipped with a working trailer wiring harness, there are a number of different solutions to provide the perfect fit for your specific vehicle. These GM systems are far simpler than later OBDII systems, but the port still allows us to read basic codes and retain emissions legality. Hopefully you’ve read Part 1 of this article, and also watched the video I’ve published talking about this. Obviously this breaks the notion of keeping the old harness as complete as possible, but it was the safest way to do this. Turn Signals We can start with wiring your radio harness with very comfortable phases. I would remove it carefully, that way you can practice on the junker as to what you have to take apart without fear of breaking stuff. Tips to rewire your vehicle like a professional. The harness is entirely plug and play - no soldering, crimping or other additional wiring of any kind needed - and replicates the original factory harness perfectly. A/C It was much easier to make changes to this figure than to reroute wires after making an error during the installation. Rubbing wire can wear through the insulation and cause a short or even cause the internal copper strands to fatigue and break. IMO, wiring can be such a pain, I would start over again unless you have a real good idea whats going on in that harness, or a gift for wiring and troubleshooting. But rewiring a new car and installing a new harness requires no more talent or advanced training than building, say, a medium-sized nuclear reactor. The tool is here: https://www.autosparks.co.uk/electrical-components/wiring-tools/ratchet-hexagon-crimping-tool-ast1.html. How much will it cost to rewire my engine wiring harness? We are your source for wiring harness repair, rebuilding, customizing & restoration. If a fuse blows when inserted, you know that that circuit has a short, The only thing to do is trace that circuit, checking all connections carefully. Sketch a diagram of your trailer wiring. Throughout this process I recommend trying to keep the old harness in one piece as far as possible – there may be wires, connectors, bulb holders or cables that you may need to re-use in some way when the new harness goes back in. Again, this is a case where your new accessory came with a wiring harness of some kind. The repairers had cut the old harness at the 4 places it passes through the firewall, and connected parts of another harness in the engine bay. 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