My indicators packe up last week but I traced the fault to the flasher unit, fitted new one £9.95 hey presto all working fine.
It's the green and white wire for the right hand side, do you have the front right one working ? if so you need to trace the front wire and find where it joins with the rear one.
+ you say you have no power at the rear did you check this with a volt meter ? If so were you using the earth in the same light as it could be the earth thats not working.
I might not be any help at all but at least I replied to your post.