Well that says : a lose ground wire or a short. That's not the bulb.

how and where do I begin to troubleshoot this?. I checked the wireing diagram but could not figure it out

If you have the diagram, you can figure it out. And if you have the diagram and can't figure it out......, you need to figure it out because if you can. You won't have to ask these types of questions.

Start by checking all of your grounds. You shouldn't need the diagram because the wires from the bulbs are blatantly obviouse.

Take your time do it with the intention of learning how to service your ride.
Make it relaxing. Keep it light and fun. Don't rush.
You may also pull a search. I know you are not the 1st person ever in the history of this forum to ask that Q.

Good Luck and have fun.

I'll will certainly try...for me at least, those diagrams are not always too clear....but I'll get it going

I'm not trying to be a dick, dude.

This is a simple thing that will be good for you to figure out. Just give it an honest try first. You're going to want to trace everything you can.
You can't mess this one up is also a very good reason.

Get a volt meter.

Supramacist is probably right i fix my ground wire on my left side and now its brighter then my right so try just checkin the ground