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Re: Re: Hot wire for trailer hookup
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Posted by MarkB on November 09, 2000 at 15:38:37 from (208.223.205.166):
In Reply to: Re: Hot wire for trailer hookup posted by Lew Van Vliet on November 08, 2000 at 21:24:02:
Using a battery isolator is the safest solution, but the drawback is that there is always a voltage drop across the the battery isolator. I'm not familiar with the automotive units, but I've used marine battery isolators, and they are just a couple of large diodes. A diode typically has a 0.7 volt drop when it's conducting. If you are in a cold climate, this voltage drop can be the difference between getting your battery charged enough to start it in the morning and having to get a jump. There's really no serious harm in directly connecting the trailer battery to the truck battery, you just need to be aware of two things: If you don't disconnect the trailer when you're parked, you will be discharging both batteries when you run lights, etc in the trailer. If you hook up the trailer to the truck when the trailer battery is dead, you will immediately start to discharge the truck battery. In other words, you might want to put brand new batteries in the trailer right off the bat.You should be able to connect the trailer to any unswitched, unfused +12VDC line. If it's inconvenient to connect it to the alternator or battery, you should have a terminal in the fuse box.
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