disconnect batt., put an ohm meter across pos. and neg cables-it will tell you if ya have a drain- if ya do, take out fuses one at a time- when ya take one out and the drain stops, you know what circuts to check from there-replace fuse and start unhooking items one at a time untill ya find your drain. NOTE: do this with the key off! key on of course, will show a drain. on seca 750, if ya use colum lock, second pos on switch (all the way left) turns on tail light- make sure you dont do that- drained my batt a time or two from that mistake. Hope this helps......Keith