wheres the flasher

it is not flasher problem. You have short circuit. Just toch cirvuit braker with fingertips and you will find hot one. Try to disconnect trailer wire from truck ( not from trailer).
of no result, check taillamps wiring. it is usual place for damaged wire insolation.

Good luck!

 

i had the same problem a couple months ago , turned out to be a faulty turn signal switch got it off ebay for 35

 

May be. But there are simple ways of diagnostic with DVOM and probe light.

Changing parts is too long way. and more expencive.

 

Explain please ?

 

I've posted these before...but, here they are again

 

DVOM

http://www.cdxetextbook.com/toolsEquip/workshop/diagnostic/multimeters.html

Simplest diagnostic tool to find 90% of all problems.



well, I tried to look for wiring diagram of '93 FLD and... I have only later diagrams. Seems to me they are different.

Here we have '00 and later US trucks. So old trucks are rare, becouse in 90-s it was greate post USSR recession and no many trucks were imported, and imported trucks were usually COE, generally International 9600-9800 with Cat3406 ore Cummins M11/N14.....

 

that is great---2 easy fixes and they didnt cost a penny--good job