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 > Jeep towed discharged when towing. This is new.

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RJL

Manahawkin, New Jersey

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Posted: 10/13/19 08:52pm Link  |  Quote  |  Print  |  Notify Moderator

JimR 1 wrote:

I have a 1999 Wrangler and I do not turn the key to the ACC.

Mine goes one click to unlock the steering wheel.

I do know that Jeep changed up things over the years.

JimR


Owners manual says to turn the key to "ACC" position. Not sure why.


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RJL

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Posted: 10/13/19 08:54pm Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

RJL wrote:

ScottG wrote:

First thing I would check is the charge wire.


It looks fine. Fairly new. Maybe 2 seasons now. No damage. How would I test if it's operating properly?


Looks dont mean anything. You need to check it while the coach is running and make sure it's delivering power to the towed.



How? Please explain

ScottG

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Posted: 10/13/19 09:17pm Link  |  Quote  |  Print  |  Notify Moderator

RJL wrote:

ScottG wrote:

RJL wrote:

ScottG wrote:

First thing I would check is the charge wire.


It looks fine. Fairly new. Maybe 2 seasons now. No damage. How would I test if it's operating properly?


Looks dont mean anything. You need to check it while the coach is running and make sure it's delivering power to the towed.



How? Please explain


I would hook everything up and use a volt meter to watch the voltage at the Jeeps battery.
When the Jeep is fully charged but not running, the voltage should be around 12.6VDC.
Now start the motorhome and look at the Jeeps battery voltage again.
It will be higher, in the range of high 13V to 14.X volts.

If you start the MH and the jeeps voltage doesn't change at all, there's something open in the charge circuit. Maybe a fuse has popped.

Good luck!

Scott


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w4phj

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Posted: 10/14/19 06:35am Link  |  Quote  |  Print  |  Notify Moderator

Voltage check mentioned above is a good procedure. I would use a clamp on DC amp meter on the charge line to easily observe the charging amperage.


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wildtoad

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Posted: 10/14/19 06:49am Link  |  Quote  |  Print  |  Notify Moderator

Jeep manuals are way out of date on some topics. My 2015 manual says to leave the key in ACC but there is no need to do that since about 2008. UNLESS you need power such as the Brake Buddy. However, not sure it would drain you battery unless you were doing lot of hard stopping or the sensitivity is set to high. I do think you should pull the battery and have it checked and check the charge line.


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Horsedoc

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Posted: 10/14/19 07:01am Link  |  Quote  |  Print  |  Notify Moderator

We have had two 4-door Wranglers and batteries failed on both pretty much like you described. The shop foreman for the local Jeep dealer told me something about X amount of power is needed in the system to make it work when starting. Both Jeeps started hesitating a couple of seconds before the started turning the engine. New batteries both times were simple fixes. Hope yours is that easy also

wa8yxm

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Posted: 10/14/19 07:55am Link  |  Quote  |  Print  |  Notify Moderator

How old is the battery in the jeep?

As batteries age they loose capacity and the Brake Buddy eats battery power. so if you don't have the capacity after a long tow. you dead.

One of the reasons (not the most important) why I do not care for the BB system or other systems like it that you install every time you tow.. that's the real reason (you have to install them EVERY time you tow)


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Jack Spratt

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Posted: 10/14/19 08:14am Link  |  Quote  |  Print  |  Notify Moderator

Towing a 04 Jeep Liberty with Blue Ox Patriot brake system, no charge line.
With engine running back one click to turn engine off per manual.
After two days of towing starts right up.


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ScottG

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Posted: 10/14/19 10:17am Link  |  Quote  |  Print  |  Notify Moderator

It could be the puter needs to be powered up while the wheels are turning but I also suspect they just want the mileage to add up so the warranty runs out quicker in the beginning.

allbrandauto

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Posted: 10/14/19 04:47pm Link  |  Quote  |  Print  |  Notify Moderator

a volt meter on the jeeps battery will tell you every thing when hooked up to your motorhome should read 13.5 and above. if not the problem is in the charge wire circuit

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