When i was rewiring my truck at one point it would step on my brake pedall and the the dashlights would flash on an off through the blinker...
Most of my issues ended up being that my high/low beam floor switch..that looked fine untill i attempted to take it appart and it crumbled into a pile of rusty insides...was somehow running stuff backwards or something...It still doesnt add up to me but...everything worked after that. GO FIGURE!
(I HATE WIRING)
Jory