heated riding vests

[gzrider]

i bought 2 heated vests me and the wife ride 2 up lots, got no kids ,and never tried to ues them till now , i went to the dealer and he tells me you cant use barely one, electrical is too weak, and its been too long, cant return them , so i hooked both up to test to see what would happen, both on low riding , no issue yet, i put both on high , headlight dimmed a bit but only did it a minuite, couldnt tell anything much, seemed to not be a problem, but that was only one day testing it. they are made by synergy, draw 4.5 amps a piece, thats 9, the owners manual says the bike is 10 amps .what dose the all knowing say ?