Lighting Mods at the BCM - Diode VS Relay

[JEA3]

Happy Monday morning, guys!  I have done a couple of the "diode jumper mods" that I have found on this forum.  Fog lights on with high beams and cargo lights on with reverse lights.  I have had those done for a while now and they have all worked perfectly and I have had no issues.  I would like to tap into the dome light circuit to power some exterior courtesy lights as well.  They pull more power than the other mods so i am a little concerned that the dome light circuit might not be able to handle all of the power without causing problems.  In doing my research I have seen people mention using relays for lots of things electrical.  I don't know much about relays, but from what i understand they allow one circuit to trigger another while putting the "pull" on the battery as opposed to the circuit that was triggered.

 

Assuming I understand that correctly, how would i go about wiring up a relay at the BCM to have the dome light circuit trigger another without fear that the dome light circuit could get overloaded?  Further more, could I have the dome light circuit trigger two other circuits using a single relay?

 

Thanks for any information!

 

 

[STRMTRPR]

have a look at this link.. explains relays very well

 

http://www.12voltplanet.co.uk/relay-guide.html

[Darth_Vader]

Why not just calculate the load and see if the circuit your dome light is on will sustain it?

[higsy]

Any word how you made out ? Far too many threads die without final words.