adding battery charger to trailer

I finally got all the bugs worked out for my battery install into my sled (to make a long story short, I found out that I had inadvertantly connected a DC ground and AC ground together, causing everything to stay at around 2-3v). I had to put a rectifier in to convert the AC to DC. What I would like to do now is find a way to keep the battery charged while it is on the trailer/in the bed of my truck. I know that the battery will charge as long as there is voltage being supplied to it so what I want to do is add a connector to my trailer that I can connect my sled so the battery will charge while I'm trailering it to the trails. So far, here is what I am brainstorming: Household plug (probably using an old extension cord) that I keep a short length coiled neatly in the front of the sled. Then mount a female plug to the trailer itself and converting the 4 way plug to a 7 way using the normal common ground/battery charge (+) for the power (see http://www.marksrv.com/wiring.htm for diagram).This will make it very easy to connect/disconnect the charger w/out any additional steps for taking the trailer off. I will have to see how the factory 7 way plug is wired, but if its a constant + signal, I will have to install a 40amp relay so that the sled battery "charger" is only seeing power when the ignition is on. I'm probably making it sound a hell of a lot more complicated than it really is, but thats how my brain goes.. lol. I do have a couple quick questions about the setup though: 1) Is there anything I am missing that may not work very well? 2) Once the snowmobile battery is at 12 volts, it will stop sucking power correct?? If so I may leave the signal as a constant + rather than installing the relay b/c I do not for-see that small of a battery EVER killing my optima. (unless i leave the sled lights on). 3) Will the factory 14/16gauge wiring be sufficient? How many amps will the battery try to pull if it is running low? Thanks again guys. If I can actually ever get around to this, I will be sure to post up pictures and a how-to on the whole process. KennyKenny

Owner / Technician

KKD Garage LLC

Albany, NY 12205