multiwatt ballast wiring

[jonk]

Hope you can help I'm trying to change the ballast on a 2x 26w fitting and the ballast i got from the wholesaler is a osram quicktronic multiwatt qtp-m and has 6 holes to terminate my wires yet the old one has 7 on the drawing the extra wire would normally connect between port 23 and 24 has anyone firstly got a clue what i am on about and secondly got any answers ??

your help would be greatly appreciated

 

[bugsy]

1 & 2 , 3&4 5&6, 7&8, filiments wired in pairs disregard link

 

[jonk]

cheers