Fender mounted turn indicators on 68 Dart

Hi,just joined this site! I have a 1968 Dart 270. It has the optional fender mounted turn signal indicators. The turn signals themselves work perfectly,even the green indicators on the dash blink,but for so reason the fender mounted indicators don't.
When I turn the parking lights or headlights on the right fender indicator lights up. Can anybody here give me some tips to get these working? Also can someone post some photos showing how you change the bulbs in them?
Also how do I change the front side marker bulbs,the ones with the chrome circles on the front fenders and what bulb do those take?