I've just got a pair pillar lights with indicators, was gonna fit friday. As i understand from what has been said, the trailer light on dash will flash when using indicators.
At the moment with trailer plugged in light on dash don't work, so will i need to change relay?

It will flash but only once without a trailer connected it's just a test, but when a trailer is connected in it will flash along with the normal dash indicator.

Have a look at the flasher relay for the part number, if it's not AMR4873 then Yes.
 
At last, got around to changing pillar lights at weekend, it was so easy just plug & play job. All works fine apart from trailer warning light not working at all.:doh:
 

Similar threads