Got this reply from Trailer Life Open Road Forum:
I'm awaiting their response now.
Here's one for the tech's.
The PSTD is louder than any gasser I've ever owned including those with defective exhaust.
I turn up the radio to overcome that.
After 39+ years of riding railroad engines my hearing ain't so great, except of course when Sue yells
, "turn off the blinker!"
Turn signal is invisible in daylight and mostly inaudible when I turn up the radio.
Aw, c'mon now, don't say turn off the radio.
I spent too many years sleeping to the roar of a diesel engine.
You don't want me out there on the highway snoring!
Where is the turn signal flasher located in my 2005 E350SD?
In older vehicles it was possible to replace the OEM flasher
with an extra loud flasher.
This helped overcome engine noise even in HD trucks.
I asked my GM service tech this same question about my '98
Cavalier and my 2002 Chevy 2500 and was told they're all
electronic now, so there is no way to swap flasher if one was
Is there any help
for me short of hearing aids??
To Your Knowledge is there an EXTRA LOUD flasher available from Ford
or some aftermarket supplier for the E-Series or F Series vehicles?
Seems like I got one for my '88 Blazer from J.C. Whitney.
Is the flasher in the E-Series an easily replaceable "tin can" or
something more complex??
It sure would be nice to hear that darned thing.