00' Taco TRD: light / electrical / cd & Tune up

2000 Taco TRD V6 3.4 L xtended cab manual.
My a.c. / heater dash lights go on and off randomly. sometimes they come on when i put on the blinker or hit the dash.. When its cold they are typically off. The CD player just spits cds out and has for a long time (before the ac/heater lights started this) Also, my left rear tail light (top light doesnt work when driving, but when in reverse everything works. When i hook up a trailer, the trailer lights will work, but the blinker on the right side of the trailer (i think the right side) won't work.
i'm wanting to put in a cd player and fix the tail lights. And a Tune up.. 207,000 miles and still going! does anyone have any suggestions and or a repair manual?

Thank you

 

Start with the tow harness - they always seem to fail eventually, and that would explain most of the symptoms you list (except for the CD player). I recommend you take the time to download the entire documentation set (30 Mb):