GMC four headlight issue

[kevmcrae]

I have a 72 GMC C15. Have the newer style halogen headlights with conversion pigtails. On high beam I was getting a short or something causing the lights to go out. If I shut the light switch off, then on again they would come back on but go off again very quickly. Low beam was fine. installed a new headlight switch-same issue. I just installed an aftermarket headlight harness with direct to battery power and relays thinking the higher power headlights were drawing too much power through the switches. Now on low beam all four are on. High beam is only the outside. I'm not sure if this was happening before I installed the new headlight harness though. So something is not right. Suggestions? Thank you, Kevin