I just bought a 1984 280GE LWB in great shape (it even passed NJ's new, enhanced vehicle emissions test), but it does have a few problems that I'd like to fix -- one of which is that, with no trailer hooked up, the turn signal indicator (the one for a trailer) improperly blinks when I signal left, but (properly) doesn't blink when I signal right (the car's own lights' indicator, in the speedometer, properly works with both right and left signaling). Any ideas where I can begin looking for this problem's cause? Thanks.