[Tron Man]

Oliver, glad to see you want to resolve your electrical problems yourself. Your turn signal problem sounds like a loose or defective flasher. Make sure that the flasher is seated. If your turn signal problem persists, replace the flasher. Note that your turn signal flasher is a different design than your hazard flasher. For your '69 GMC you will need a two bulb turn signal flasher like a Turn-Sol brand. A hazard flasher will work but you loose the burnt out bulb indication feature a turn signal flasher has.

For the headlight problem, check the grounds on each of the outer head lamp connectors. You should see a black wire from the head lamp connector that terminates to a ground on the radiator support structure. Undo each ground and check for corrosion. If there is corrosion use a small wire brush to clean the connections. Note that on GM products your inner bulbs light on bright only. If the grounds are OK you'll need to make voltage measurement on the outer head lamp connectors. Post back and let me know how you made out on the turn signal an head lamp ground issues. Also, do you have a multi-meter or 12 volt test lamp.

Tron Man,
Reno,NV