I've done this before...mainly on my GL1100 classic Goldwing
Would work fine if you want to go there on the FJR
The biggest decision is "are you OK with make it more difficult to take the side bags off"
Wires have have to get to the inside of the bag...sure, you put a two prong connector where
the wire leaves the bag before it goes under the seat...but there you are
you could either replace the side reflectors or put something like theses on top of them
they attach with sticky tape on the back...I had no issues with them not staying put
something like this (I would only go the led route)
https://www.jcwhitney.com/led-marker-lights/p2003411.jcwx?filterid=j1
drill an appropriate hold where the wires come out the light all the way through to the inside of the bag
run 2 element wire from the light around the bag and through a hole on the inner most wall of the bag
you need enough slack that opening the bag will not pull on the wire...I'd run it where along strap that keeps the bag horizontal.
the wire can be very small gauge...where ever the wire runs along the wall of the bag, you tape it to the wall with electrical tape
attach a two prong connector to the wire coming out the bag...use something kinda big and and easy plug in, plug out if you remove the bags often
I virtually never remove the bags for riding...only for cleaning the bike (twice a year!!!) or trailering (to the shop).
run wire to under the seat...add a opposite connector where the wire sticks out from under the seat
check this thread out for led strips on mirrors which parallel what you want to do, just the lights themselves and the wiring placement is diff
https://www.fjrforum.com/forum/index.php?showtopic=124646
check my post #14 which is the cool "wig wag" option
the lights are on as running lights, but when the turn signals are operated, they blink opposite the stock signals in a wig wag fashion
very cool and I'm no electrial tech...but with good instructions, I can handle a step by step procedure and I've taught myself
to solder, crimp...and my favorite connector, posi locks which are the bomb and my forever chosen electrical connector
the thread is exactly what I did on my Feej which I think is a better solution that hard bag lights
(thanx Sac Mike who's thread led me to do his mod)
it's a good excuse to go with FZ1 mirrors on your superior Gen I (I have an '04)
my strips can be seen from all angles of the mirrors...front, back, and side
a local feej of mine said, in the fog, those amber strips wide on the mirrors were the first thing he saw coming up behind me
and he knew it was me because if have the most lights on the bike of anyone
check it out and hope that helps and is something good to think about
Ride Safe,
Mike in Nawlins'
mholiver at patriotguard dot org
(I don't use PM's)