ROC Rank: Senior
Join Date: Apr 2010
Model: *Former Ridgeline Owner
Model Year: 2006
Color: Steel Blue Metallic
Re: Fog lights problem - they come on by themselves and then don't work anymore
Okay, first things first. Get your battery tested. I know it sounds silly, but you'd be surprised.
The only real way to diagnose an electrical problem is to start at one end and move step-by-step to the other. I know it's a PITA, but I've "been there done that." You'd be surprised what a bad switch can do. However I suspect a bad relay. If I recall correctly, Honda had an issue a while back with fuel pump relays crapping out after a few years. The solder on one of the circuits would develop a hairline crack, rendering that circuit inoperable. Could be a similar situation.
2006 Steel Blue Ridgeline RTS