Is there a forum here about adding lights to your truck? Nothing big just maybe some simple leds, I am fully ready to get shot down as some may view it as a waste of time, but hey, I’ll ask anyway. Do you wire yours into the sidelights, or have you found maybe another route to go down?
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Mine came new with loads fitted.
Pain in the ■■■. Forever got lights out.
They don’t call 'em fairy lights for no good reason. 
Who owns the truck?
Who’s paying for the lights?
If you need to ask then pay someone to do it before you cause £100s of damage to the wiring looms. When I used to do auto electrics I’ve seen some right gash jobs, some of which have resulted in large portions of the car’s wiring loom being melted to the point the only solution was to replace it which often means hours of labour just taking stuff out of the vehicle, such as the dashboard, so you can get to it all.
Conor:
If you need to ask then pay someone to do it before you cause £100s of damage
Good advice in many different fields.
Of course YouTube has many videos of “how to” including installing electrics.
Some of the videos are even getting it right!
But unless you already understand the basics, how would you know which are good and which bad?