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Expert Answers about Marine Power


  • 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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  • 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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  • 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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  • Can I Plug Subwoofer Into Audio Output Connection on Jensen jwm70a Stereo
  • Yes, the audio outputs on the Jensen stereo jwm70a are RCA outputs that can be used with an amplifier and then a subwoofer. You could also use an amplified subwoofer like Jensen Enclosed Amplified Marine Subwoofer - Surface Mount part # JMPSW800 which has RCA connectors that would plug right in and you would not need a separate amplifier.
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  • No Power Going to 4-Way Trailer Connector on Hopkins Wiring Harness 40455 on 2007 Ford Escape
  • The wiring harness # 40455 is designed for the 2007 Ford Escape or Mercury Mariner with a factory tow package. Some tow packages need more fuses and/or relays to function or wiring that runs from the front of the vehicle back to the port. If your vehicle did not come with a factory tow package, this harness will not work. Adding a fuse is a step in the right direction, but additional fuses, relays, or wiring may be needed to make it fully functional. If you look through the owners manual...
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  • Troubleshooting Trailer Lighting Circuit Blowing Fuse Even When Trailer Is Disconnected
  • If the connector has 12v power it is possible that corrosion can cause the power to jump circuits and blow a fuse, though that is not usually the cause. If you do find corrosion in the connectors it is likely that there is also corrosion inside causing issues and the connector should be replaced. If you can tell me which connector your trailer uses I would be happy to recommend a replacement. What I would do first is check all of the wires that are powered by that specific fuse that is...
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  • Troubleshooting Trailer Breakaway Wiring that Melts When Pin is Pulled
  • Do the brakes seem to work fine when used normally? The Tekonsha breakaway kit # 20020 normally can be used on trailers with up to 4 brake axles. The problem has to do with the amount of amperage draw the brakes are trying to put on the system and not the battery though. I'd look for a short on the trailer's wiring or maybe you have a bad trailer magnet. I attached a help article on troubleshooting trailer brake magnets for you to check out as well.
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  • Troubleshooting Interior Lights Not Working On an Enclosed Trailer
  • It sounds like your interior lights on your 2019 Legend are powered off a secondary battery. The exterior clearance/ marker and tail lights are powered directly from your 2020 GMC Sierra 1500. The small battery on the front is generally only used for electric trailer breakaway brakes. If being used with additional lighting the battery is replaced with a larger unit. You will want to check for any additional terminals which you may need to trace from the light switch itself. If you have...
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  • Troubleshooting Electric Tongue Jack Not Working When Connected To 2019 Ford F-150
  • It sounds like you may have the power and ground wires reversed. I have included an image below for the terminals on a 7-way connector so you can verify you are connecting to the correct wires on your trailer connector. The power terminal is located at the terminal in the 1 o'clock position while the ground is located at the 7 o'clock position when looking into the vehicle 7-way. Your 2019 Ford F-150 requires tow / haul mode activation and / or load detection on 7-way before the +12V output...
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  • Troubleshooting HydraStar Electric Over Hydraulic Trailer Brakes
  • The first step is to ensure that your brake controller is compatible with the HydraStar Vented Marine Electric Over Hydraulic Actuator for Disc Brakes # HS381-8067. I recommend contacting HydraStar directly for compatibility details. If your controller is compatible I would inspect the wiring on the HydraStar unit. There are 4 wires coming out of the unit. White is the 12V ground wire, Black is 12V Positive, Blue goes to 7-way and receives power from the brake controller when pedal is...
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  • Troubleshooting E.C Error Code With Fogatti RV Tankless Water Heater
  • Sediment build-up may also causing you to continually receive the E.C error code on your Fogatti RV Tankless Water Heater # LSB44FR. Since your unit is pretty new it is unlikely but I would try and rule everything out first before replacing the unit or buying anymore replacement parts. You also might also consider installing a Camco RV and Marine Disposable Water Filter w/ Hose Protector # CAM40043 which will remove aluminum, bacteria, bad taste, cadmium, chlorine, fungus, heavy metals,...
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  • Recommended Battery Monitoring System For RV Batteries To Help Prevent Overcharging
  • The fact that your converter overcharged your batteries leads me to believe it's replacement time for your converter since it isn't properly functioning. That being said we do offer monitoring systems like the Go Power RV Battery Monitor Kit with 25' Cable # GP44FR. This monitoring system will allow you to easily see the charge rate and consumption of your batteries and can also let you set shutdown alerts when the voltage is too low or high. If you want to replace your WF-8735P then...
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  • Trailer Brakes Locked Up After Sitting
  • For starters, I am going to assume that you have electric drum brakes. The issue you described of the brakes locking up could be caused by several different things. In order to save yourself some time, I recommend hooking up the trailer to a different tow vehicle or the tow vehicle to a different trailer. This will then allow you to pinpoint which side the issue is occuring on. When you said that you disconnected the trailer from the tow vehicle did you check to see if the brakes released?...
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  • Troubleshooting Installation of Tekonsha T-One Vehicle Wiring Harness on Lexus NX
  • From what you have said, it sounds like you connected your wiring to the positive and negative battery connection. When installing the # TK73VR, the ring terminal should be connected to the positive battery cable. Nothing should be connected to the negative. Prior to attaching the black wire to the positive side you will disconnect the negative battery cable. The negative battery cable will be reconnected once you're done with the wiring, along with the installation of the 15 amp fuse....
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  • No Trailer Running Lights
  • asThe first thing to do is take a look at the owner's manual of your '14 Tundra to locate any trailer fuses or relays and ensure they are all there and in working order. If they are, in order to determine the specific problem you will need to purchase a circuit tester if you do not have one - the very handy Cordless Circuit Tester # PTW2979 would be my strong recommendation due to how easy it is to use - and test the connector on your vehicle after disconnecting it from your trailer. Check...
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  • Troubleshooting OEM Brake Controller 2016 Chevy Silverado Not Working with Brake Pedal
  • Your generation of truck has this issue sometimes and the problem ends up being that the third brake light fuse is blown. This is same circuit as the brake controller stoplight circuit of your truck so what I would recommend is check to see if your third brake lights up when you press the brakes and if not replace the fuse for the third brake light.
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