Turn Headlights on W/ Disarm

i was thinking of using my dome light output to turn on my reverse lights (like the new chevy's)and headlights(i have the HID system) in my 2001 Xterra. now im not using the dome light output casue on my truck the dome light goes on with the door locks. i was gonna tack the neg ouput to 2 relays and turn it to pos. 1 for headlights one for the reverse lights. do i have to diode isolate them or will the realays be enought tokeep the cercuits seperate.

also where do i get the wires and what colors are they

thans for the help and sorry for the long questions. just want to make sure b4 i do anything to be safe

you will have to isolate them with diodes that is you best bet for any reason.  better off i dont know what your reverse light wire is but you hedlight wire is

red -left

red black white  8 pin connector

or the head light switch.

ok cool so no relays right.

what amp fuse do you recomend.

and i need 2 relays for the headlights i cant tap it off of 1

thanks again

i meant no diodes sorry about that.

and about using 1 relay for the 2 head;ights i cant do that. what about fuse amperage. i think im gonna piggy back the relays

thanks

Hi carguy411, no problem, after reading your post again, I fiigured that's what you meant.

You can fuse your main power lead from the battery with a fuse equal to that of both headlight fuses, but be sure to fuse each relay separately at the relays with the same value fuse used for each headlight, so if your headlights each have a 15 amp fuse, use a 30 amp main fuse at the battery, then a 15 amp fuse at each relay.

ok kool. i might do it this week some time

thanks for all your help