i installed a lot of alarm and remote starter in vehicle but now i'm have a problem under standing what a diode isolate is and is this something that i have to install before wiring up the alarm.
here what the wiring diagram note#2 say from bulldog security for my 2000 deville.
drivers door is a tan - at the drivers door module in the drivers door,for all other doors there is a dark blue - at each door module in each door. you must use all 4 wire and diode isolate when connecting to an alarm system.