I have a 1987 Chevy Silverado with a 5.7 350 TBI and having problems with the passenger side window. The passenger side switch works great but the driver side switch will not let the passenger window go down, when you hit the switch to lower the passenger side window the motor bogs down and the lights dim, but the driver side switch will raise the passenger side window great.
I have replaced both switches and the passenger side motor and both switch connectors.
What do y'all think the problem could be? I'm thinking electrical problem but have looked that far yet.
First, just to make sure I have everything straight:
1. Only the RH window has a problem - the LH window is okay
2. When the local (RH) switch is used to operate the RH window, there is no problem - going up or down.
3. If the remote (LH) switch is used to operate the RH window; it can be
raised normally (just like with the local switch). But, if you try to
lower the RH window from the remote switch, it fails to respond. However, even though the window doesn't move, it seems as it is being supplied with power because the lighting dims and the "motor bogs down".
Since the motor operates fine in both directions when power is supplied by the local switch - and in the raise mode from the remote switch, it is likely that there is reduced voltage available for lowering (from the remote switch). It's also possible that the motor isn't getting a good connection to ground - when in the lower mode.
When the LH switch is toggled to the DOWN position, 12 VDC is supplied from that switch to the RH motor on the TAN lead and the DK BLU/WHT lead provides the path to ground. When the LH switch is toggled to the UP position, current flow through those two leads is reversed - now the DK BLU/WHT is hot and the TAN lead goes to ground.
The initial diagnostic check would be to see if that is the case (i.e. TAN hot & DK BLU/WHT grounded) while holding the driver's side switch in the DOWN position.
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