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Old 09-01-2010, 11:26 AM   #1
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2002 31' Classic
Caledon , Ontario
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Power Jack is weak

The power jack on my 2002 Classic doesn't seem to have much power. However, when I've got the trailer hooked to 120v it's okay. Any ideas what the problem is? Thanks.
Duncan
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Old 09-01-2010, 11:36 AM   #2
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Have you checked the voltage at the batteries and the jack when not plugged into shore power? The voltage should be between 13 and 14 volts DC. The jack takes power directly from the batteries, but is picking up charge power when plugged into shore power.

It sounds like the jack is fine, the wire from the batteries is fine, the jack is properly grounded, or it wouldn't work well when plugged in. The batteries could be failing. Does the jack work better on batteries after they've been charged a while while the trailer is plugged in, but not so good after several hours have passed? If so, it would seem the batteries are not holding a charge.

You can also use a battery tester on the cells.

Gene
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Old 09-01-2010, 11:45 AM   #3
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Clean the ground connection...?...

I added a frame ground connection
by the battery and at the jack.

Suggest you check the connections
inside and out for corrosion and / or being
tight. All the way to the battery terminals.

If 120v is good and 12v is weak....Start with
the battery, next the battery terminals, and then the frame
ground connection(s).
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Old 09-01-2010, 11:53 AM   #4
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I agree with Crawford, except a battery NOT on a charger will be at or around 12.6V. Charge voltage is between 13 and 14 V. 12 V batteries have 1.2V per cell (Approx). If just coming off a charger, turn on a few lights for a minute, to remove any surface charge, then test voltage. Should be around 12.6V. This, however, is not conclusive evidence of a good battery. Voltage could drop rapidly under load. Most auto parts stores can load test one for you. I use a Midtronics load tester, but they are quite pricey.
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Old 09-01-2010, 11:54 AM   #5
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Excuse me...dyslexia seting in again....2.1V per cell.
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Old 09-01-2010, 12:30 PM   #6
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Quote:
Originally Posted by dznf0g View Post
a battery NOT on a charger will be at or around 12.6V. Charge voltage is between 13 and 14 V.
Duh, correct.

Gene
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Old 09-01-2010, 12:52 PM   #7
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sieve,

When was the last time you greased the jack? If you still have the booklet that came with it, you'll see what I mean...
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Old 09-01-2010, 12:57 PM   #8
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Aage's right that the jack needs periodic greasing—the grease flies off the gears and you may be able to just put it back—but, if it works when the converter is getting 120, it's probably not grease. Make sure you have instructions if you decide to grease because once you take the cover off, you have to reset the gears and if you don't know how, you will be very unhappy.

Thanks for reminding me, Aage, that I haven't checked the grease in too long.

Gene
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Old 09-02-2010, 07:21 AM   #9
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Looks like I've got a number of things to check. Thanks to all of you for your help. I'll let you know what I find out.
Duncan
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