research on internet provided the answer...
a produce known as 'add-a-circuit' made by LittleFuse and Bussmann works in the following manner. you unplug an existing fuse from the GM fuseblock. you then insert the 'add-a-circuit'. on the topside of the 'add-a-circuit' is two female fuse connectors. you plug the fuse you removed into the 'lower' female fuse connector (this acts as the original fuse for the original circuit hardwired into the fuseblock). you then plug in the fuse you would need for the additional item you are adding into the 'top' female fuse connector (this is the fuse for the additional circuit that you are adding). there is a wire that extends from this assembly - you crimp your devices hot lead to the wire. this provides the +12 vdc to your new device. you must therefore ground your new device at the chassis, or any electrical ground attachment point that you can find.
my problem now is that i dont know if the fuse size is the older (larger) ATO or the newer (smaller) ATM. will need to wait till i get home tonight to figure this out.
hope this helps.
