2003 Chevy S10 Pickup fast flashing signal lights

1984 a flash back in time and history
only books exited then ,
sorry no CDs, no PDFs just BOOKS made of paper.
so how do you find digital media that never existed??? on a super rare car.
gee I can not guess that,
but book stores comes to mind.

if car was 2000 year yes, but not 1984 those are BOOKS.

so finding the most rare car in the world that was scan by happy owners, what is the chance of that. zero i bet.
and google tells me the same no frisky scanners posted copyright books online, oops.
******* that. but sure if posted in wikileaks it will live forever.

the books you do see are 3rd party, like Haynes publishing. not chevy.
and very expensive as the books too are RARE and out of print.
Clymer , chiltions and haynes, be costly to buy 3 and no chapter on diesel.
the real parts list here covers the diesel

https://www.ebay.com/itm/363775508145?hash=item54b2b5beb1:g:238AAOSw8gFiPNYR

on ebay you can put a search watch that emails you every time a S10 books is posted. that is how I got all mine on older 4wd trucks.

You will get the wiring diagram from the given link Home Toolsnyou https://toolsnyou.com

I would try measuring for 12 volts at the socket while the turn signal is on.

bad multi-function switch

Usually when they flash very fast it means a bulb is bad, but if no reverse lights either it might be a short in the wires.

It is as simple as your hazzard switch needs to be replaced yes your hazzard switch as now turn signals are built threw the hazzard switch my PT Cruiser had same problem as my s10 replaced hazzard switch fixed the problem

check voltage from brake switch to signal light switch, signal goes from brake pedal to signal switch then to taillights, i suspect the problem is in that area

behind the radio, take the radio and the cover that goes over it. it should be there next to the hazard ligths flasher.

Try checking the headlight switch it may have broken contacts in it. Easy fix go to a salvage yard find same make and model truck, swap headlight switches.