I have the worst luck with solder it is rediculous, thats what takes me so long to produce mods......I can't get solder to stick to the positive on the batt connector and at all to the rca jacks that I use for my usb option that I make everything. the only way I can get them to work is if I solder wire to wire around the positive and around the negative.......how do I resolve this, any suggestions would be greatly apreciated. thanks in advance