Dont start replacing al those things yet.
(why did you replace the headlight switch?)
Do you have an automatic or manual?
In automatic your reverse lights are also related to your neutral safety switch (NSS, plenty threads on that one). Since you already replaced the bulbs and checked the fuses, it could be a cause.
Usually also tends to give you trouble with starting in park/neutral at times, if the NSS is malfunctioning.
If so, clean or replace your NSS.
The rear indicator light is not related to this.
Fuses checked out fine?
Last edited by Roler; 04-09-2012 at 10:09 AM.