Reminds me of a restaurant owner who decided to serviced his own Briggs & Stratton (54series) generator with Automatic Mains Failure panel. After the service the generator would start and shut down with numerous errors on the controller. So he called a 'fly by night' generator repair shop and they told him the panel was faulty. So they replaced it ( USD 1200). Still the error. So they replaced the AC power alternator (USD 900). Still the generator would start and shutdown with 'over volts' or 'under volts' or under frequency. So the Tech disappeared.
Eventually they contact me and we head out to site. I listen to the above story from the owner and stood for a minute taking in the information. That's when I noticed that the engine had a non original oil filter and they guy said the problem started immediately after the service. That got me thinking... if he serviced with non original filters I bet they did not use the correct spark plugs.
So I checked and they had used chinese non resistor spark plugs.. these were causing interference with the digital generator controller and causing it to malfunction. So I quietly changed the spark plugs out. All the while with the owner is in the background telling my Apprentice "he's wasting his time, I've already change the plugs!.. the problem is with the AC generator not the engine".
Once I had changed the spark plugs.. I packed my tool bag up, pressed start on the control panel and walked to my vehicle to pack up and do the paperwork. The generator started and ran without fault.
The restaurant owner came running to my vehicle and said what was the problem? I told him it was the spark plugs and gave him my bill (USD 80) and he said "I'm not paying that much just for spark plugs... the one's I bought only cost USD 2.50." I said no they didn't, they cost you USD 2100!!!
Strange how people will pay idiots thousands of Dollars for essentially doing nothing.. but for travelling 100 miles and actually fixing the generator I get asked to justify my bill.
Reminds me of the story of the ship engineer who knew where to tap!
Knowing Where to Tap