[Easy Rider]

The housing of your new lights might not be bolted to a frame member that is connected to negative battery.
What happens if you touch that black wire to the housing......or that mounting bolt shown in the picture ?
A voltmeter would be REALLY helpful.

 

[Easy Rider]

Knowing stuff really is:
Living a long time.
Making a LOT of mistakes.
Remembering most of them.

Remembering reports from others helps too.