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  #13  
Old 07-29-2016, 01:57 PM
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Quote:
Originally Posted by grandriver125 View Post

Have you done it yet? If you have could you describe in detail the connections and results? I assume wire run from positive terminal on Jeep battery to the 12V pin in the 7 pin plug going into the 7 pin female unit on the MH? And how did you ground or are you relying on the existing ground?

GR
You're right about the 12V+ line. Don't forget the fuse. I ran a 10 gauge wire for the ground and attached it to the ground point on the Cherokee's fender well next to the battery. I did have a black ground wire as part of a 4-wire harness, but disconnected it and ran a separate 10 gauge wire through the umbilical line to replace it. Otherwise the connection would be limited current-wise to the skinnier wire's capacity.

The objective is to tie together the MH and Cherokee batteries in parallel by running an appropriately sized wire (I chose 10 gauge which might be overkill but as I said before, it's cheap) between each battery positive and another appropriately sized wire between each battery negative. The MH's alternator will keep both batteries charged.

For the positive wire I crimped/soldered on a 10 gauge fuse holder and put a 30 amp fuse in it, followed by a circular terminal and connected it to the post and nut available on the Cherokee battery. Ran that through the umbilical cord (I originally made this using wire loom from Home Depot making it easy to add the new positive and negative wires) to the pin in the plug, as you said. For the negative wire I crimped/soldered a circular terminal and connected to the post and nut on the fender well next to the battery and ran that wire through the umbilical cord to the appropriate pin in the plug.

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  #14  
Old 08-03-2016, 08:21 AM
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Re: Flat towing behind MH - power connection to battery

Just to add my two cents....I had the new Jeep harness installed. I thought the removal of a little 10 amp fuse post towing was kind of stupid so I cut and ran the live feed (put and inline 10 amp link in for kicks) to and all weather switch (with pilot light) installed on the front cowl. Now I just hit the switch and all is on/off. I all so purchased the RVi towed vehicle unit (yes I spent the $50 instead of making up my own!), the ordering process and Sam who I spoke with at the company was super. The unit is well made (US) and is very easy to install. Getting a 12V feed to the RVi unit was made a little more complicated in my case because I use a wireless toad light set up. The wireless transmitter uses a four blade plug so I have to use and adaptor off the 7 pin round plug on the motor home, I therefore had no way (at least to my weak mind) to access the live wire lug. I merely tagged into the live wire behind the MH plug and ran a two wire (live and ground) wire thru a new 4 pin round plug on the MH to a four pin round plug that I placed on the lower right corner of my license plate bracket (had to cut the plate just a little). Ran the live to the RVi unit and the ground to a ground lug on the jeep and all is perfect.
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Old 08-03-2016, 08:47 AM
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Re: Flat towing behind MH - power connection to battery

I ordered the RVi product the other day and it is on the way. Glad to see you found it an easy install. I use wired mag lights so I won't encounter the same problem you did. Thanks for the update.

I'm going to bill FCA for the RVi kit. They likely need a good laugh.

GR
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  #16  
Old 08-06-2016, 09:59 AM
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Re: Flat towing behind MH - power connection to battery

If you go with the Roadmaster InvisiBrake it has a buit in circuit to charge the battery.
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Old 08-06-2016, 02:04 PM
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Re: Flat towing behind MH - power connection to battery

Quote:
Originally Posted by hexrays View Post
If you go with the Roadmaster InvisiBrake it has a buit in circuit to charge the battery.

Have a 12 year old Brake Buddy that is still working well so no need to change and spend a bundle more. Second, Invisbrake has to connect to MH 12V so that issue still exists.

Our RVi charge unit has arrived and we may install next week.

GR
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Old 08-08-2016, 09:54 AM
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Re: Flat towing behind MH - power connection to battery

I have a couple of issues with my 12 year old Brake Buddy in that one the cleat that goes over the peddle does not fit the fat Cherokee's fat brake pedal shaft. Brake Buddy sent me their new adapter but that did not work to my satisfaction at all. I took my grinder and open up the cleat more to fir over the pedal but that approach is not ideal either. The other issue is the drivers seat face is at such and angle the Brake Buddy does not mate up well at all, couple that with the leather and the Buddy slips upwards and the push force is negated. I have tried to tip the seat bottom up as far as the electric controls will allow but it still does not work as well as it use to on my old Liberty's. Anyone have a solution other than buying and under the seat model!
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Old 08-08-2016, 12:36 PM
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Re: Flat towing behind MH - power connection to battery

I use a couple of clamps to hold the BB on to the pedal. Annoying how the pedals have changed. I also have a 2 x 4 with a piece of plywood that I put in between the seat and BB to keep it from sliding around.

PITA for sure.

GR
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  #20  
Old 08-11-2016, 01:51 PM
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Re: Flat towing behind MH - power connection to battery

Question - where did you locate that GROUND LUG. I had look under the hood and my untrained eye didn't see one. My son has been out of town and has not had a chance to look at it yet. Hoping to do that tomorrow.

Tx
GR

Quote:
Originally Posted by ragoodsp View Post
Just to add my two cents....I had the new Jeep harness installed. I thought the removal of a little 10 amp fuse post towing was kind of stupid so I cut and ran the live feed (put and inline 10 amp link in for kicks) to and all weather switch (with pilot light) installed on the front cowl. Now I just hit the switch and all is on/off. I all so purchased the RVi towed vehicle unit (yes I spent the $50 instead of making up my own!), the ordering process and Sam who I spoke with at the company was super. The unit is well made (US) and is very easy to install. Getting a 12V feed to the RVi unit was made a little more complicated in my case because I use a wireless toad light set up. The wireless transmitter uses a four blade plug so I have to use and adaptor off the 7 pin round plug on the motor home, I therefore had no way (at least to my weak mind) to access the live wire lug. I merely tagged into the live wire behind the MH plug and ran a two wire (live and ground) wire thru a new 4 pin round plug on the MH to a four pin round plug that I placed on the lower right corner of my license plate bracket (had to cut the plate just a little). Ran the live to the RVi unit and the ground to a ground lug on the jeep and all is perfect.
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Old 08-11-2016, 04:44 PM
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Quote:
Originally Posted by grandriver125 View Post
question - where did you locate that ground lug.

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Old 08-11-2016, 08:29 PM
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Re: Flat towing behind MH - power connection to battery

Nice. When I searched around that looked to me like the only possible place. Will try tomorrow.

Many thanks.

GR

ps. Talked to one of the chaps at RVi today - very helpful. Jeep should have made this a part of the harness package frankly.
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Old 08-11-2016, 10:46 PM
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Re: Flat towing behind MH - power connection to battery

OK, I'm getting dizzy. I just recognized a problem and not understanding this stuff makes it more difficult. I have mag lights and I wired the 4 pin connector to the 7 pin plug as expected - LH stop and turn, RH stop and turn, tail lights and GROUND. Then, my mag lights plug into this 4 pin standard unit.

Now the problem. Using the 12V supply is not problem. BUT, what do I now do for the ground for this power supply. The ground connection in the 7 pin is already in use with the mag lights.

Given what I paid for the Limited for ease of towing I'm getting more and more PO'd with FCA. I contacted Jeep Cares a week or two back on this forum and the real was simply that they would not provide any help or advice on this issue of power to the Jeep from the MH for liability reasons. Just wonderful.

How do I solve this ground problem. I'm hoping my son will get back in the next day or two. Surely I can't just connect a second wire to the ground pin?

GR


Quote:
Originally Posted by ragoodsp View Post
Just to add my two cents....I had the new Jeep harness installed. I thought the removal of a little 10 amp fuse post towing was kind of stupid so I cut and ran the live feed (put and inline 10 amp link in for kicks) to and all weather switch (with pilot light) installed on the front cowl. Now I just hit the switch and all is on/off. I all so purchased the RVi towed vehicle unit (yes I spent the $50 instead of making up my own!), the ordering process and Sam who I spoke with at the company was super. The unit is well made (US) and is very easy to install. Getting a 12V feed to the RVi unit was made a little more complicated in my case because I use a wireless toad light set up. The wireless transmitter uses a four blade plug so I have to use and adaptor off the 7 pin round plug on the motor home, I therefore had no way (at least to my weak mind) to access the live wire lug. I merely tagged into the live wire behind the MH plug and ran a two wire (live and ground) wire thru a new 4 pin round plug on the MH to a four pin round plug that I placed on the lower right corner of my license plate bracket (had to cut the plate just a little). Ran the live to the RVi unit and the ground to a ground lug on the jeep and all is perfect.
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  #24  
Old 08-12-2016, 01:00 AM
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Re: Flat towing behind MH - power connection to battery

Quote:
Originally Posted by grandriver125 View Post
How do I solve this ground problem. Surely I can't just connect a second wire to the ground pin?
Your MH and Cherokee use negative ground systems tied to their chassis. Their battery negative terminals and chassis and any conductors connected to the chassis are electrically common. To solve the ground problem you run a wire between the ground on the MH outlet to the ground point in the picture. You have a ground wire for your mag lights. You can splice into that wire and connect to the ground point in your Cherokee.

This is where the size of that wire matters. If it's not big enough, you could replace the mag light ground wire with a larger one and use it for both your mag lights ground and charge line ground. In this case you could attach the larger ground wire from the MH, and the ground wire from your mag lights to the ground lug on the Cherokee.
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