Bubble Rust and what causes it on a truck tractor frame or just truck frame. 

It's called electrolysis! It usually happens when you have a positive wire that comes into contact with a negative wire through an electrolyte! What is an electrolyte: an electrolyte; is salt and water aka "Road salts" or a salt brine mix that's sprayed on the road surface to prevent icing and snowing of the road surface. 00:03 What bubble rust look like, 00:06 What causes bubble rust, 00:14 The wire I find was the result of someone cutting a power wire to a Qualcomm system, 00:26 How bubble rust starts, 00:48 Electrolysis test, 2:20 Corrosion caused by wire loom rubbing against the insulation of a wire. Jump over marker light wire and tail light wire, 3:28 It's an SAE violation "J code" The wire can not handle the total current of the trailer lights through one wire, 3:41 Result of the electrolysis test, 3:51 Where the bubble rust starts and why, 5:03 Other problems that can occur with electrolysis, 6:53 End of video and conclusion. YEAH, Bill, is smart! Lol!