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Old 03-06-2019, 06:48 PM   #43
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1996 25' Excella
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The jack should work from the 7 pin connector. Your TV battery supplies 12V through the charging circuit to the trailer from your battery. On mine the 7 pin runs the jack when there is no battery. Do you have a fuse on the 12V line from the TV battery. If you had bad switches, that fuse would potentially be blown...mine was when the limit switch in the jack failed.

I suspect you have a bad battery (the one you tried first), or you have a bad power supply line from the trailer to the jack. Not sure why two batteries work when one won't....12V is 12V, unless the one battery is not putting out 12V. Your experience defies logic but can't argue with fact! so not sure what to say.
JCW
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Old 03-06-2019, 07:36 PM   #44
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Originally Posted by JCWDCW View Post
The jack should work from the 7 pin connector. Your TV battery supplies 12V through the charging circuit to the trailer from your battery. On mine the 7 pin runs the jack when there is no battery. Do you have a fuse on the 12V line from the TV battery. If you had bad switches, that fuse would potentially be blown...mine was when the limit switch in the jack failed.

I suspect you have a bad battery (the one you tried first), or you have a bad power supply line from the trailer to the jack. Not sure why two batteries work when one won't....12V is 12V, unless the one battery is not putting out 12V. Your experience defies logic but can't argue with fact! so not sure what to say.
JCW
When he connected one battery, he connected one of two positive cables and one of two negative cables. My suspicion is one of negatives went to the ground buss bar and one went to the converter, and he used the one that went to the converter.

Al
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Old 03-08-2019, 03:33 AM   #45
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Originally Posted by Al and Missy View Post
When he connected one battery, he connected one of two positive cables and one of two negative cables. My suspicion is one of negatives went to the ground buss bar and one went to the converter, and he used the one that went to the converter.

Al


Agreed - must be something like that.

So another question then - I am assuming that when I hook up the single battery to test this again (because Iím so curious!), I gather I need to connect both positives and both negatives (and the positive from the jack) to the single battery to complete the circuit - is that correct? It seems so but Iíve only ever had the pair running at the same time and this was my first experiment (failed) connecting just one....
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Old 03-08-2019, 07:34 AM   #46
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You only need the positive wire from the jack feed connected to the positive post on battery and the black ground cable that goes to the bus bar or trailer ground connected to the battery neg post.
the circuit needs to be completed from positive to negative with a good battery in place.

for it to work with the 7 pin and dead batteries you need a complete circuit from batteries back to trailer bus bars, plus the above.
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Old 03-08-2019, 07:45 AM   #47
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You only need the positive wire from the jack feed connected to the positive post on battery and the black ground cable . . . connected to the battery neg post.
Amen!



Keep it simple, Stu.

Avoid analysis paralysis.



Jumper cables could do this IMO, assuming you include the inline glass fuse in the circuit.

Peter
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Old 03-08-2019, 08:04 AM   #48
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Originally Posted by AlinCal View Post
You only need the positive wire from the jack feed connected to the positive post on battery and the black ground cable that goes to the bus bar or trailer ground connected to the battery neg post.

the circuit needs to be completed from positive to negative with a good battery in place.



for it to work with the 7 pin and dead batteries you need a complete circuit from batteries back to trailer bus bars, plus the above.


Got it. Thanks.

So curious! Appreciate the help.
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Old 03-21-2019, 03:13 PM   #49
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Well kids - this just in - single battery connected properly and the jack works just fine. Moreover, I took out the bulb, cleaned off the contacts and put a thin film of dielectric grease on the contacts and lo and behold - the light works too!

Feels like a strong camping season in the wings!
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Old 03-22-2019, 07:59 AM   #50
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Feels like a strong camping season in the wings!

Ok - may have jumped the gun there....

I woke up at 4:00 this morning startled, realizing I connected the pair of batteries incorrectly. I was so exited about testing the single battery with the jack that I screwed up the double install. The picture in post #10 is how itís supposed to be connected. What I believe I did was to put the main positive and negative cables on the same battery (closest to you in the pic). Everything else was wired correctly. I have not turned on the battery use switch.

Iím going to correct it after work today.

Iím assuming this wonít hurt the batteries at all - I just need to put the positive terminal on the second battery (after disconnecting the negative first....) - if that assumptionís faulty, please let me know.

Sounds of Han Solo in my head saying, ďdonít get cocky, kid...Ē
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Old 03-22-2019, 09:11 AM   #51
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Please help diagnose my jack problem

The difference it makes doing it the Ďrightí way is super tiny. But it wonít hurt anything either way.

Donít beat yourself up over it, besides, Han shot first...
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Old 03-22-2019, 10:07 AM   #52
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Ha! Good point!

Thanks. Iím so excited about camping season, I let my guard down on the install.....I even had that pic open on my phone and checked it several times! Amazing what you can force your brain to miss when youíre focused elsewhere!

Pure curiosity - whatís the tiny difference? I worried whether this meant they were hooked up in such a way to either double or halve the output....

Iíll correct it - but whatís the tiny difference you mentioned?

Thanks!
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Old 03-22-2019, 11:16 AM   #53
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When both charge or discharge cables are connected to one battery, that battery gets charged/discharged more than the other due to the resistance of the jumper cables running to the other battery. If those cables are large, the difference is probably not significant. When the positive cables are connected to one battery and the negative cables to the other, the losses are distributed since each battery only sees the loss of one cable.

Al
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Old 03-22-2019, 11:30 AM   #54
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Please help diagnose my jack problem

Yup. Exactly. And The difference given a heavy jumper cable will be only a few millivolts. Not real significant in the wider scheme of things. Where it becomes significant is if you have an inverter or other heavy loads on your parallel set of batteries.
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Old 03-22-2019, 12:07 PM   #55
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Brilliant. Thank you both!
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Old 03-23-2019, 01:12 PM   #56
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Corrected the wiring before hitching up to get a new set of tires today. Even if only a minimal issue, just felt like doing it.


Felt great to be towing the Tin Goat again!!
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