Hey
Can't believe nobody replied.
Sounds like a ground, to check it, take a set of jumpers, clamp on the grond off the battery, then to chasis and motor, XXXX ALL GROUNDS XXXX don't jump the 12 volts.
Check to see if the lites are off.
Now if I can only figure out why my inside flasher indicators sometime work sometimes not, flasher sometimes just stays on. I am going to try a relay but I can't see the relationship, when the exterior bulbs work (flash) and interior - nothing. Maybe the flasher unit is special multi pins unit.
Good luck with it
WBR
Joe