Ok, I'll try, but please bare in mind that I find it hard to explain this without drawings when I'm sober, never mind after being on the vino for 4 hours
Righto, just using one lamp (bulb) for ease of example, the current should come from the battery through the switch to the bulb and then back to the battery via the negative/ground, giving you 12volts across the bulb.
From what you described, it sounds like instead of going directly to ground from the bulb you want on (say the left side), the current is having to go through the bulb on the right side (which is the one you want to remain off) to find its way back to the battery, which will mean that the second bulb is getting rather less than the 12 volts required to power it properly which is why its duller than the one you want to be on and visa versa when you want to indicate right
This is why I think you should check the negative connections for your indicators, they are most likely a common link to both sides, so maybe they are not making in the connector block for some reason, maybe the bike side of the connector has been pushed through?
Admittedly I haven't looked at the connectors on our bikes, but I'm assuming they'll be like the old jap bikes I had
Hope this helps, but I'll have to re-read this tomorrow, you cannot imagine how many spelling mistakes were made typing this
BTW, mixing red and white wine is ok isn't it? Its not like mixing Grape and grain is it? Worried now, mind wandering, giving away too much information
I'll be around a bit longer if you need anything clarifying I'll do my best, got another half bottle to go
