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Check for;

a shorted or bad bulb

bad ground in socket

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Q: Why does 1991 gm van right turn signal causes all lights to flash?
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A right-turn signal causes the emergency lights to flash when the headlights are turned on. What is the cause of this problem?

A mis-wiring or short circuit somewhere between the controls, fusebox and lights.


When your right turn signal is on all 4 rear lights flash?

Bad ground.


When i operate turn signal switch it doesn't flash lights to the left or right but the emergency switch turn flashing lights on.?

Replace the turn signal flasher relay.


Why do the left signal lights not flash on your GMC Sonoma?

If the right one works,it might be a bad bulb or a bad ground.


I have a turn signal problem on my 97 Jeep Cherokee. The drivers side turn signal works but the dash board lights also flash. When the head lights are turned on the right turn signal does not work.?

That sounds like a grounding problem, probably near the right side lights. It might be a rusty or disconnected ground wire.


What is wrong if Right turn signal lights do burn but will not flash on 1995 Buick LeSabre?

Sounds like you need a new flasher.


1989 silverado left turn signal set applying brakes causes the left turn signal to dimm and the two right rear tail light bulbs to alternate brightly?

1989 silverado left turn signal set applying brakes causes the left turn signal to dim and the two right rear tail light bulbs to alternate brightly? Further problem occurs to same truck - in Park and brakes not applied -- if head lights are on turn signal flash slows right down almost to a stop and becomes very dim


What causes both signal lights on the trailer harness to blink on a 2004 Chevrolet 2500 hd when you turn right?

POSSIBLY A BADGROUND


Why does the side turn signal indicator lights on my 1998 Toyota corrolla fail to flash after replacing both right and left side bulbs and flasher?

You have to replace front and rear bulbs.


Why does the left turn signal flash faster than the right turn signal on a Mercury Grand Marquis?

When it flashes fast it means you have a burned out bulb omn that side. Check all you lights and you'll find the one that's burned out.


What causes a rapid turn signal on a 2002 blazer?

It has been my experience that a rapid turn signal indicates there is a burnt-out signal light bulb (either front or rear) on the side of the rapid blinking signal. If the right signal is blinking rapidly, the problem is in the signal lights for the right side (front or rear) of the vehicle. Turn the rapid signal on and step out of the vehicle to find which bulb is not lighting.


What causes the blinkers to stay lit on the right or left unless you shake the signal lever up and down or from side to side in which case they will flash on the front on a 2003 Chevy Tahoe?

I would replace the turn signal switch.