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Open Roads Forum  >  Dinghy Towing

 > Battery goes dead on my tow vehicle

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daveb48

Coldwater, MI

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Posted: 03/27/11 01:52pm Link  |  Print  |  Notify Moderator

We have a 2008 Dodge Caravan that we tow behind our Class A motorhome. When we travel after dark and turn on the headlights on the RV, the battery in our tow vehicle goes dead. This doesn't seem to happen during day trips, only after trips that run into darkness. We connect the tow vehicle to the RV with all the required equipment, including wiring. One person I talked to suggested disconnecting the battery on the tow vehicle but this seems cumbersome to me. Has anyone else had this problem? Any suggestions?

Turtle n Peeps

California

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Posted: 03/27/11 02:06pm Link  |  Print  |  Notify Moderator

Your not getting any charging from your class A to your TV for some reason. You have to find out why your TV is not being charged. Fuse? Wiring?

To double check it, get a VOM and check the TV battery voltage at rest. Then start your class A up and bring to a fast idle. The TV battery voltage should read around 14.2 volts or so (maybe a volt or 1.5 volts higher than at rest).


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Bumpyroad

Virginia

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Posted: 03/27/11 02:54pm Link  |  Print  |  Notify Moderator

turn off radio and all accessories. are you using a brake system that is plugged into the 12 volt outlet? if so, buy a small jumper/starter battery thingy to plug your brake buddy, etc., into.
bumpy





larry_kruzan

Pekin, IL

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Posted: 03/27/11 03:15pm Link  |  Print  |  Notify Moderator

All the above, plus - seems like there is one lead of the 7 pin that carries the charger circuit. On my TV, I had to add a relay to the electric box under the hood in order to charge my TT. You would think that fuurd would put this in when you order "trailer tow package", but there I go thinking again.


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daveb48

Coldwater, MI

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Posted: 03/27/11 03:22pm Link  |  Print  |  Notify Moderator

I forgot to mention that I do have a Brake Buddy unit that plugs into the lighter outlet. I'm wondering if the connector cable might be faulty and not charging like it should. Thanks for the help, by the way.

surveyorjp

Missouri

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Posted: 03/27/11 03:23pm Link  |  Print  |  Notify Moderator

The battery is going dead on your "towed vehicle", not your "tow vehicle" . You might try this question in the Dinghy Towing forum, as that is the place for discussing towed vehicles. This section is for vehicles towing trailers.

Best of luck to you!


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Bumpyroad

Virginia

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Posted: 03/27/11 03:59pm Link  |  Print  |  Notify Moderator

daveb48 wrote:

I forgot to mention that I do have a Brake Buddy unit that plugs into the lighter outlet. I'm wondering if the connector cable might be faulty and not charging like it should. Thanks for the help, by the way.


that is probably your main problem. as I said, buy a little jump starter/battery source and plug the BB into that. I want it along anyhow.
bumpy

Bumpyroad

Virginia

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Posted: 03/28/11 03:13pm Link  |  Print  |  Notify Moderator

Just got a new Heartland catalog. have a PortaJump for $29.99 with free shipping that would prevent these problems from ruining one's day.
bumpy

bid_time

Michigan

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Posted: 03/28/11 06:24pm Link  |  Print  |  Notify Moderator

Bumpyroad wrote:

daveb48 wrote:

I forgot to mention that I do have a Brake Buddy unit that plugs into the lighter outlet. I'm wondering if the connector cable might be faulty and not charging like it should. Thanks for the help, by the way.


that is probably your main problem. as I said, buy a little jump starter/battery source and plug the BB into that. I want it along anyhow.
bumpy
I'm not an car electrics guy, but it seems to me if it was caused by the brake buddy unit, it would drain the battery whether or not the headlights were on in the TV or not.





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