Posted by JDEM on December 11, 2017 at 06:32:30 from (174.230.17.149):
I bought a 2002 Chevy Astro Van AWD as a totaled insurance wreck. I am almost done with it but have one electrical problem. I have no understanding of the "theory of operation" of the turn-signals. I have a full set of Chevy tech manuals for 1996 Astro Vans but for 1996 it is obviously different. So at the moment - I do not have a good idea on how this was supposed to work when all is right.
When I turn on the right turn signal - there are two separate bulbs that flash consecutively. I.e. first one, then the other, then back to the first, etc. NOT both at once. There is the main big bulb that blinks "on", and then the smaller marker bulb blinks "on." The problem is with the left (driver's side). For that side, only the big bulb blinks and does it twice as fast as is supposed to. Nothing from the smaller bulb. Note also that the same smaller bulb is a parking light when the flashers are not used. When I put on the parking lights - all work except the front left. I have no wiring diagram for a 2002 and don't know where to start. I am wondering - what actually does the flashing? If it is the flasher unit - I am wondering how it makes two bulbs flash independently at different times?
I could just say the heck with it and stick in an electronic flasher unit that is not load-dependent. That won't fix the actual problem, but will let the larger flasher bulb blink normally.
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