Don't get dis-heartened .... you've just joined the rest of us with trying to work out a problem with blinkers or the electrics in general. Had a cracked housing on the rear RHS light housing on my (ex) T3 SC ..... found a pair @ a swap meet in great condition so set about replacing the 2 rears. All lights worked fine ..... removed housings and bulb holders then swapped the bulbs into the new bulb holders after checking and cleaning connections .... this is when the LHS decided not to work ..... swapped back to original bulb holders ..... now the RHS ..... checked fuses and relays and cleaned connections = still no joy. Found an old trailer light wiring look so removed it in case it was the cause = nope. As the old bulb holder had corrosion and the bulbs old decided to go down the get a set of new bulbs + fuse and relay ..... expense not great ..... put new bulbs in newly acquired bulb holders and re fitted, replace all fuses and relay ..... will they work ..... we got illumination on all lights as it should be Moral .... auto electrics is a mongrel of a thing to work out & on ..... wiring up the turn indicators to blink separate to each other on the fuel gauge in Paddy the Type3 Fastback was a nightmare but once we worked out that in the instrument cluster the lights were on a reverse polarity we got them to work right for right & left for left not both @ once as per original VW design.