Is ur truck federal or california emissions?
? Federal, from Flint, MIDuraTech;1553837; said:Is ur truck federal or california emissions?
If a plu was snapped off or burnt up, this would tell you as well?DuraTech;1553909; said:U have to take the 8mm nut off of each glow plug (one at a time) and test the end with a test light to power if u have a light it's good, no light bad glow plug!
Thanks I'll have to run and get a light(after baby wakes up), someone stole mine as well as my voltmeter.DuraTech;1554002; said:Correct, the test light needs to be connected to positive post. There is never stupid question, when it comes to a duramax!! truck needs to be off, u can test a plug in ur hand if u had to. Good plugs will light up