To solve this particular conundrum, you need to clear your head over the “10 wires” issue, and first concentrate on getting your turn signals working correctly
LED turn signals have a lower resistance rating, and can confuse your flasher unit. It’s a bit like having one bulb blown, causing the remaining bulb to stay on constant – not enough resistance to allow the bi-metal strip in the flasher unit to perform
There are two ways around this problem – either you can start wiring in diodes (thus increasing the resistance) – or you can opt for a digital flasher unit rated for your indicators (available from your local stockist or on-line). This second option is less confusing, and a cheap alternative unless you know what you’re doing
http://tw200forum.com/forum/technical-help/11142-led-turn-signals-anyone.html - post #5
The matter is further confused by having the two front blinkers stay on permanently as per US regulations – get the wires mixed up and “oh boy” – so the first thing to do is to check that your LED indicators (if you’ve bought a completely new set of them) has the requisite wiring – two wires for the back pair, and three wires for the front pair. This is partly the reason for so many earth wires laying around the place, and why you need to keep them intact and as they are
The following paragraph is pure guess work based on logic, and not reliant on any wiring diagram – so take it as starting point, and try to get your head around the principle ….
(With all indicators in place) - With your indicator switch in the “off” position, find the one wire of three leading to the front indicators that still has a 12v supply – that’s your “constant on” supply. Then disconnect the wires to the flasher unit, and try the remaining two wires to find the “ground”. With the indicators attached to the circuit, try it to confirm. This leaves one wire, check it for continuity to the (still detached) wire to the flasher unit – that’s your bunny
Once you get your head around the principle, the rest is easy – one wire for constant – one wire for ground – one wire to the flasher unit. Repeat the process for the rear indicators, one wire for ground – the other one has to lead back to the flasher
This all depends on having a “digital” flasher unit, and front (at least) indicators with three wires – you can forget about the “dash” bulb for now – just get those indicators wired up correctly
Confirm, and I’ll get back to you on how to deal with those “ten wires” on your speedo ……..