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Expert Answers about Mercury


  • Troubleshooting Turn Signals Going Out When Brakes Are Pressed After 4-way Connector Is Installed
  • Since the turn signals go out when applying the brakes in our 2009 Mercury Grand Marquis I recommend using a circuit tester like # PTW2993 on the green and yellow wires when you have the turn signal on and the brakes are being applied. If you are getting power on the green wire or yellow wire on your wiring but the turn signals are not working that means there is a grounding issue on the trailer side. I recommend double checking the main ground on the tongue of the trailer that it is...
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  • Troubleshooting Trailer Wiring Harness Converter on 2008 Mercury Mariner
  • It sounds as if you might have shorted out your converter box. I will link you to a video that demonstrates how to test the converter. You will test the wires on the input and the output side of the converter. If you have signal entering, but not leaving the box, it will need to be replaced with the # 118551. You should also check the fuse where the power wire connects at the battery. If that fuse is blown, replacing it might fix your problem. If the fuse and/or converter was blown due...
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  • Exhaust Hanger Touching Hitch and Transferring Vibration and Noise through a 2010 Mercury Mariner
  • I am looking at the install pictures and if I am reading things correctly, the steel hanger welded to the exhaust pipe is touching the hitch. This in turn sends exhaust vibrations into the vehicle and that is what you are hearing. You have a few options of how this can be corrected. The first is what we do here in our shops, and that is simply re-bending the hanger so that things do not make contact. The hangers are not always welded on the same way at the factory and some times they warp...
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  • Troubleshooting Tail Lights on 2008 Mercury Sable Not Working With Curt T-Connector Installed
  • The Curt T-Connector # C56015 is designed to be an easy installation on your 2008 Mercury Sable so since you made sure that the tees with the yellow wire was on the driver's side the only other things that could have been messed up is if you either didn't connect your Sable tail light wiring into the tee or if you didn't get a sufficient ground for this harness. It's also possible that this wiring harness is malfunctioning. You can determine if this is the case by testing the wiring that...
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  • Only Running Lights on Trailer Work After Installing Hopkins Wiring Harness on 2007 Mercury Mariner
  • Vehicles using trailer wiring harness # 40455 may need to see a local Ford or Mazda dealer for a relay. The relay is needed to activate the tow package wiring circuit. It sounds like your 2007 Mercury Mariner is missing that relay. Also check to make sure that the trailer side connector is clean and free of corrosion because that can cause lights to not work.
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  • Troubleshooting Trailer Lighting # 118551 Wiring Harness Installed on 2009 Mecury Mariner
  • Locating your problem will require some troubleshooting. You will first need to determine if the problem exists with the vehicle wiring or with the trailer wiring. Typically, the problem occurs on the trailer. To rule out the vehicle, start by using a circuit tester like part # PTW2993 on the trailer connector on the vehicle, as each function is being operated. Have a helper activate the left turn signal, then test the pin on the connector that corresponds with the yellow wire. Activate...
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  • Trailer Wiring Harness Drawing Power from 2008 Mercury Mariner Hybrid with Vehicle Off
  • Because trailer wiring harness # 118551 requires a direct connection to the vehicle battery, the power wire will be energized all the time because it is connected to the battery. However, with nothing drawing power on the 4-Way end that power has no where to go (nothing is drawing it). So just having the harness installed cannot drain the battery unless something is plugged into the 4-Way and is drawing power. If you have the power wire connected anywhere other than the vehicle battery...
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  • Will the Edge Insight Display Transmission Fluid Temperate on a 2003 Mercury Marauder.
  • The transmission temperature on your 2003 Mercury Marauder should run through the computer and be accessible through the OBD-II port using the Edge Insight, # EP84030. The parameters that you could potentially monitor include: Battery Voltage Intake Air Temperature (IAT) Engine Oil Pressure (EOP) Engine Coolant Temperature (ECT) Engine Oil Temperature (EOT) Transmission Fluid Temperature (TFT) Miles Per Hour (MPH) Miles Per Gallon (MPG) Revolutions Per Minute (RPM) 1/4-mile and 0 - 60 times
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  • Troubleshooting Trailer Wiring Harness That Instantly Blows Fuse When Connecting to Battery
  • The Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # HM11140395 having a spark as well as blowing a fuse is a sure sign that the ground is not connected properly or the power wire at some point is touching a metal ground. I recommend tracing that power wire to ensure there is no insulation missing where it could be touching metal. You can see with our installation of this wire we used wire loom # 7509-10 in some areas to assist with areas that have sharp...
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  • 12 Volt Circuit Does Not Work on a 2002 Mercury Mountaineer
  • There are not a lot of boat trailers that require a 12 volt circuit but regardless it may not be a fuse you are looking for but a relay. Consult the vehicle owners manual for the locations of all fuses/relays associated with the factory tow package wiring. If there is a relay for the 12 volt circuit then the only way to really test it is to put a known good relay in its place. The manual will also cover any fuses you may have missed. If your Mountaineer came with a 4-Way and you are using...
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  • Troubleshooting Trailer Wiring on a 2008 Mercury Mariner
  • If you tested the wiring on your 2008 Mercury Mariner and it is operating properly but then when you install a wire converter unit the 4-Way flat connector isn't operating properly then yes, I would say that is an indication of a faulty converter/ModuLite wiring unit. In this case I recommend replacing your wiring with the T-One # 118551 as it sounds like you don't have the factory tow package. I really like the Tekonsha wiring kits because we tend to have the fewest amount of troubleshooting...
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