What could be shorting out the radio and the dome lights?

Lots. cars bounce , wires flex and break then short. all moving machines to that. (bad designs. in my book) read "flight 800" and cry.

my wild guess is the radio fuse blows.???? why not say?
that means the line is shorted or the load there, is shorted.

the way to find this is easy, to hard.
disconnect the loads. short gone, its bingo time.


if not , the power feed is shorted.
that means this wire is shorted some where.

i have a magic tool, that finds this fast. most dont. (i have TDR)
but i have a LINK, to a long video of a man, Duane doing this.
and ASE master, watch him.
https://www.youtube.com/watch?v=TZrCrBx4uFY

its a trainng class, so is slow. but good.

what all techs to is ISOLATION method first.
loads off, ? still shorted. then
check the current with the magic, cheap circuit breaker and ammeter check.
then start pulling the harness connectors end to end
and find which section is shorted.
that is it , just that. its only a wire, nothing to fear
sometimes you can just follow it with eyes and see why its shorted.
its not magic, in the video the wire was burnt by the exhaust parts.
one more example with real car, real schematics as an example.

http://www.fixkick.com/power-elect/blows-fuse.html


good luck finding your shorts.