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Old 08-23-2015, 05:16 AM   #1
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Sanibel 3601 charging battery while towing

I have a question, while towing my battery goes almost dead. We have the residential fridge, after towing for 3-4 hour's. It so low that the fridge quits working. They say that tow vehicle will not charge battery. I'm thinking of installing a circuit to change the battery while towing. Putting a circuit protection and a diode. Any suggestions on this? Thanks
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Old 08-23-2015, 05:34 AM   #2
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Do you have tow haul engaged and is battery switch in correct position
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Old 08-23-2015, 06:33 AM   #3
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Battery switch?
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Old 08-23-2015, 07:09 AM   #4
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Tow Haul would not anything to do with the 12 v charge feed. I would check your fuse or breaker in the TV. I know in F Series and Super Duty there is a fuse and relay for charging. Be aware that charge current might only be 20 amps and the amount of power required for the invertor is much greater. The charge line will help but you will get more operating time out of the Trailer Batteries.

The statement of TV won't charge the battery is incomplete, will not fully charge the battery or as I mentioned keep up with current draw.

Alternate solution is add more batteries with higher capacity. Personally I will never buy a residential fridge, always propane equipped.
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Old 08-23-2015, 08:13 AM   #5
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First thing to do is make sure your vehicle has been set-up to charge through the plug, like Band B said ford has a fuse or relay and I know GM has a fuse also that is not activated from the factory.
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Old 08-23-2015, 12:54 PM   #6
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To see if your truck is sending the 12V charging current to your trailer, measure between pins 1 and 4 on your truck’s trailer plug. Please note that some vehicles, like my F350, only supply this charging current with the truck engine running while others will do this even when shut down.

As B and B said, your tow vehicle may not be able to supply all the power your refrigerator requires but it will help the battery extend how long it can run the refrigerator.

If it ends up you needed to add a relay or replace a fuse on your tow vehicle, consider the discharge problem if the vehicle supplies current when the vehicle is turned off, as you could drain your starting battery if they are left connected too long.
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Old 08-23-2015, 12:59 PM   #7
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Quote:
Originally Posted by jimmyt11664 View Post
I have a question, while towing my battery goes almost dead. We have the residential fridge, after towing for 3-4 hour's. It so low that the fridge quits working. They say that tow vehicle will not charge battery. I'm thinking of installing a circuit to change the battery while towing. Putting a circuit protection and a diode. Any suggestions on this? Thanks
Your trailer battery will charge a bit while towing down the road, but with the standard wiring in the truck and trailer, it will not be much more than a few amps. If you need a more robust charge, you will need to size the charge wiring correctly based on your power needs. Using the inverter will require significant 12v power. Here is one tool to assist with determining proper sizing: Circuit Wizard - Blue Sea Systems Notice that the tool needs the total distance both to and from the alternator to the inverter or trailer battery.
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Old 08-23-2015, 01:54 PM   #8
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Make this a little easier at first. Check to be sure you have 12V at the proper connector pin on the trailer plug in as show by TGR above. Check the line for fuses that might be blown from the connection to the battery. Then ask self, IS THAT BATTERY ACTUALLY FULLY CHARGED TO BEGIN with, because if it is not, the TV will never keep it up. Then what do you have for batteries in the TT/FW? IF you are going to be running a Residential Frig two big deep cycle golf cart 6 v batteries are probably a minimum. Our friends drove out in their nice new D'pusher with Residential Frig and the Dealer only put two little cheapy 12 v 80 amp batteries in for them. They were lucky off grid, if the frig ran through the night before they had to start the generator for four of five hours. So we looked and sure enough, the coach was designed for FOUR Six Volts, with room for a second battery rack (option?). In short WITH RESIDENTIAL FRIG you need lots of battery and you need to keep them charged
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Old 08-23-2015, 02:09 PM   #9
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My fuses were OK in my Ford van, wiring OK, plug OK.
THE RELAY, listed in the owner's manual , that powers the TT, (it was a factory install)
was shot. A very quick cheap, plug in replacement.
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Old 08-23-2015, 03:22 PM   #10
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I have inspected my TV which is a 2014 F350 with the 6.7 diesel. The relay and 30 amp fuse is in place. I was at RV specialist in Elkhart Indiana. they told me that it is not wired to charge the battery. It's on a single 12 volt deep cell battery. I am asking is anyone else who has a 2015 3601 Sanibel has wired it. RV specialist said that I should put a solar panels to charge the battery. I think that I could get by with running a new circuit. I full-time, so the battery is always fully charged before we get out on the road. I still will check for voltage at the truck connector. The Engine has to be running so the relay is energized. If anyone has a Sanibel with the residential fridge. Please fill me in. Thanks for all your help.
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