Strange noise question

[thatblacklac]

I just replaced the fog lights on my esky. Everytime I turn them on I hear a strange poping noise from the back of my truck. It doesn't affect anything on my truck but I was just wondering if this is normal?

 

[chauncey0337]

That sound is your rear wiper jumping. It's caused by feedback from fog light circuit to rear wiper ground and it's a common problem. Here's a thread that shows a step by step procedure on how to fix. It even gives you part numbers. Post #5.
http://www.tahoeyukonforum.com/forum/showthread.php?t=10815