Help Needed Rewiring America Front Indicators

My America (2010) has non standard indicators and since the winter lay up they have been playing up.
The front one's have not been flashing until I've given the wiring a nudge. So today I thought I'd do something about it. At this point I should say that I know more about Einstein's Theory of Relativity than I do about electrics. The wires from the non standard indicator are white and black while the wires from the indicator switch are green and yellow/black. Am I correct in thinking that as it's just a bulb, it doesn't matter which way round I connect it ?
My intention is to solder and shrink wrap the wires.
TIA.