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Old 06-30-2009, 04:19 PM   #1
1 Rivet Member
1969 25' Tradewind
Fairport , New York
Join Date: Jun 2009
Posts: 5
Battery installation, cables, Univolt

I am not sure which are the pos and neg battery cables on my recently acquired 1969 Tradewind. One cable is red, the other a bundle of white cables. Neither appears to go directly to a ground. I installed a deep cycle battery with red to pos and the white wires to neg. 12 V things worked well. I then plugged into AC and had the Univolt plugged in for a week. When I unplugged the Univolt, no 12V. Battery was completely discharged. Any help would be appreciated. Thanks

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Old 06-30-2009, 04:46 PM   #2
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1991 34' Excella
Princeton , New Jersey
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If you have a volt meter lift one of the wires on the battery. Now plug in the univolt and check for 12 volts across the wires at the battery. You should see +12 volts with the positive lead of the voltmeter on the red wire. If you see a -12 volts there that is your problem. The battery may be toast. The univolt was wired in opposition to the battery. If that is the case reverse the wires at the univolt and check at the battery wires again.

You can try to charge the battery once it is wire correctly but I have my doubts. If it can not be saved try and find an old battery and wire it in for an over night test before buying a new one.

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Old 06-30-2009, 04:52 PM   #3
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1969 25' Tradewind
1971 18' Caravel
Berkeley Springs , West Virginia
Join Date: Jan 2005
Posts: 415
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I got a 69 Tradewind also. I got rid of the Univolt and old fuse panel.

Well to be honest I've kept it as a backup dc power supply currently in use in my 71 Caravel as a dc source. I hooked up the battery two weekends ago and sure enough with 24 hours it had started to overheat the battery and there was evidence of swelling in the used battery I had installed. They just aren't good at regulating a charge.

I would replace it and have one less headache

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Old 06-30-2009, 06:20 PM   #4
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2011 34' Classic
Westchester Cty.NY , / Miami FL
Join Date: Jul 2007
Posts: 3,122
was the battery you installed in a charged state when you put it in?

is it charged now?

while on shore power, does the voltage taken with the volt meter at the battery match the + and - markings on the battery?

does anyone know if that model had a switch to turn off the univolt?
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Old 07-01-2009, 04:49 AM   #5
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1969 25' Tradewind
Fairport , New York
Join Date: Jun 2009
Posts: 5
Thanks for the replies and suggestions. I didn't see them until this AM. But last night I installed the recharged battery. It is a marine deep cycle, purchased on 6/11 from Walmart. I had them check and recharge it yesterday. It checked out OK under load at the service center, so I'm assuming the battery is OK. It was "severely discharged". I reinstalled it and all 12v items worked. Lights, radio, fan. I did not plug into the AC, so the Univolt was off and I was just running on the 12v system. So, the battery was dead this morning. I just have a bulb tester that I used to check the battery at the terminals and got a faint glow. So I must have a pretty good short somewhere. And then I remembered this has an electric jack which does not work. I'm thinking if there is anything that can suck that much juice in such a short time that might be it. I will disconnect that and then plug in the AC to see if the Univolt will actually recharge the battery. That will be today's adventure.
This is a great forum. I appreciate all the help and suggestions. And today I will probably buy a voltmeter. I think I'm going to need one.
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