Don’t forget about the basics…
We’ve all been there, elbows deep in a diagnostic, can’t seem to figure out why the system is not working properly. After messing with it for way to long you realize it was a blown fuse that is causing the issue. You might be reading this and be like “I would never do something like that”, but let me tell you, a blown fuse has caused more diagnostic nightmares than you could imagine. Prime example, this past week I was called out to a shop for a no communication issue. When I got there it was way more than just a no communication, literally nothing in the vehicle was being powered up like it was suppose to. The technician that was working on the vehicle had just installed an ignition switch, and an aftermarket alarm system. After the install the vehicle has zero power to any system. When I got there I verified the concern, load tested the main power wire in to the ignition switch and guess what? No power was being supplied to the ignition switch. After a quick check of the wiring schematic, I realized that during this install some how 2 40amp fuses were blown. Replaced the fuses, verified circuit integrity and was on my marry way. So with all this said, always remember to check your basics. Does the circuit have proper powers and grounds with proper circuit integrity? If not, that needs to be your starting point.
