Where is the wire to dome lights?

Ok so I'm trying to hookup my bed lights and rock lights to my dome lights so that whenever the dome lights come on it'll turn on my lights (by remote or by opening a door). I'm using a relay and need to find the dome light wire to splice into. Anyone ever done this before and know where to find this wire? Pictures would help tremendously. TYIA!

 

@caribe makaira

Sorry for putting you on the spot, but can't think of anyone better

 

You'll need a gadget sold by @DSIM.
The 2nd Gen Cab illumination ground is a PWM circuit. His gadget will prevent relay coil chatter when circuit turns on or off.

 

it's all good, no worries

 

#9 BLUE wire.

 

@DSIM what gadget is this and how much is it?

@caribe makaira what will happen to the relay if it "chatters" too much lol. Will it harm the electrical system in some way? or just die prematurely?

 

Test it. Fused Power to relay coil side and the negative side to the blue wire. With door open press the door switch at that door frame to input the door closed signal.

 

https://dsimsolutions.com/products/domerock-v4
Gadget...