I have the Premier wiring loom and the original Sierra dash. Do i put the black and white n/s and the black and green o/s wire into the same input in the dash?
The light on the dash only works when i indicate right but not left.
Steve

I think that it's normally one to each side of the bulb - at each flash, the bulb is fed 12V from one side and earths through the bulbs on the other side.

Steve,
Connect one side of the W/L to the leftside circuit, the other to the right side circuit.

The W/L is, say, 2W, so it draws 1/6 amp (2w/12v) and is 72ohms (12v / 1/6A)
The indicators one one side are 21W, 21W and 5W, so total about 48W. They therefore draw 4A and have an effective resistance of 3 ohms (of the 3 bulbs in parallel).

So apply 12V to the bulbs on one side: you also have 12V dropped across the W/L and the other side indicators.
You now have a simple potential divider. 12V is dropped across 72 ohms in series with 3 ohms; this gives 12 * 72 / 75 volts across the W/L and 12 * 3 / 75 volts across the indicators. i.e. you have about half a volt across the external indicators and 11 1/2 volts across the W/L.
Therefore the W/L illuminates and the indicators on the non-flashing side don't.
HTH
John.

Jesus H John. I dropped physics as soon as i could because i didnt understand stuff like that
Im sorry but i need someone to talk to me in simpler terms

Steve,
Just take the first line, then!

Connect one side of the W/L to the leftside circuit, the other to the right side circuit.

The W/L itself is not earthed.

John.