That talk with a old fleet mechanic really got me thinking...

I was swapping a injector on a 2015 Kenworth last Thursday and this guy Bobby who's been turning wrenches since the 80s walked over. He flat out told me I was wasting time chasing electronic faults when 90% of his problems get solved by checking grounds and harness rubs first. He showed me three trucks where I spent hours on scan tools and the fix was just a chafed wire behind the firewall. It hit me different because here I am relying on laptops and he's just looking at the truck and finding stuff in 20 minutes. Any of you old school guys got a habit that saves you time that newer techs miss?

3 comments

3 Comments

emery_young1327d ago

Buddy of mine works at a Peterbilt dealer and had this old timer named Frank come by to show him something. Frank went straight to the battery box on this truck that had a ghost issue, felt the cables, and said "your ground strap is loose." Sure enough, two seconds with a wrench and the dash lights stopped flickering. My buddy said he had spent three hours with a multimeter and a laptop running diagnostics, had printouts everywhere. Frank laughed and told him to always start at the battery and work out, never trust the computer until you've touched every connection with your own hands. That story stuck with me because it proves how easy it is to overthink stuff when you're staring at a screen.

riley_schmidt27d ago

Had a similar thing with my old F150 a few years back. Was chasing a weird electrical gremlin that kept killing the battery overnight. Spent two days swapping relays and checking fuses. Then my neighbor came over, just wiggled the negative terminal, and said "your battery clamp is loose." Tightened it down and never had the issue again. Made me feel like an idiot but also taught me the same lesson Frank was getting at.

the_joel20d ago

Hold up, is it really that deep? Sure, Frank saved some time, but three hours with a multimeter and a laptop sounds like the guy was just learning how to diagnose properly. You gotta know when to use the tools and when to trust your gut, but that's not gonna magically fix a corroded ECU connector that a multimeter would actually find. Lotta old timers get lucky with their "feel" because they've seen the same three problems on every truck for forty years.