i know this has appeared a million times, but i can't find a simple answer to my simple question. i have a 65 malibu that i have added ss guages to and i want to hook up the ammeter and need to know the correct location to hook the wires to not the guage end. the gm manual only shows from the guage to the bulkhead at the firewall. currently one is hooked to the horn relay and the other is at the pos junction by the battery (on radiator support) it seems to work,but i have a draw on the battery when car is off,but i changed alot of wiring and added a custom autosound hidden audio unit(memory wire?) thanks.