My (few) experiences with auto electricians have taught me to do minimal fault finding and just rewire the offending circuit. Providing a dead short is NOT involved, that will solve the problem even if it doesn't clear the cause.
Inter-related stop light and indicator faults usually involve bad earths.
It might be worth checking the battery drain for each of your circumstances to make sure that only the expected amps are being used when each circuit is activated- need that friend and a meter between the +ve battery terminal and its lead.
Last edited by IanA; 4th June 2017 at 11:30..
Reason: Additional advice