You got a screwed up module. Swap the sequential modules (if
they were plug-n-play like the CDCs are) from side to side and see
if the problem follows the module or stays with the same side of the
stang as it was originally before you swapped the sequential modules.
They are simple to bench test as you only need a ground and 12 volts
to make them sequence. Its not rocket science. Either they work or
they dont. The clearance lights, or 'lows' as you call them are independent
of the sequencer harness and should functon even if the module is bad.
The SJB monitors for shorts and you would have a DTC set.

What brand of sequentials do you have, cegha?
They are not all the same. Cheap ones
use cheap wide tolerance value electronic
components that vary between components
of the same marked value. The timing on the
WebElectrics is done with cheap capacitors and
cheap resistors with lets say up to 15-20% tollerance
between them. You try and design a precision timing
circuit using cheap components and have the same
assembly be the same as the last one made and the
one after that. Cant be done without matching
components and using some sort of timing tester.
Then the sets would have to be matched to each
other sale. Digital is the way to go when it comes
to timing circuits. Heck, the SJB does it digitally when it
flashes the turn signals for a predetermined amout
of time or when locking the doors with the remote.
The SJB even mimics the faster flashing of the
turn signal side with the burnt out bulb like the
old bi-metallic strip flashers of yesteryear.

 

http://www.stangmods.com/Mustang-Seq...ls-p/00517.htm

Those are the ones i purchased. As i said, it doesn't seem to list a vendor so i'm not sure who makes those off the top of my head. So could it possibly be a outted light bulb, or is it a harness problem?

 

If they still work but take time to illuminate with the brake pedal depressed,
the bulb(s) is(are) not burned out. I looked at the StangMods seqs linked to
above and cant determine what brand they are either. CDCs would be
sporting their logo all over the box and instruction sheet as well as on
the actual electronics and harness. Budget no name sequentials is what
it seems like you have there. Swap the modules from side to side and see
if the problem follows the bad module. Or better yet, remove the offending
module and bench test it for proper oreration.

 

I pulled the harness and tested it on the other side, and had the same problem. How would i go about bench testing the harness.

If it is bad, is there anything i can do, or anyway to purchase a new left side?

 

How about a picture of the unit(s)?
Maybe I can identify the manufacturer by the look of the seq unit?
No need to bench test it.
If the problem followed the module, the module is bad.
Return for refund or replacement.
Bummersville.

 

Mine does the exact same thing when locking. Mine also seems to be messed up when actually running the turn signal, hazards, etc..., on the right side. I haven't bothered with it yet because it isn't extremely noticeable. BTW, got mine from American Muscle who sells webelectric.

 

I hate it when products don't work properly.