[WindChill]

1987 Quad 70k mi: Right front indicator light is acting up. When switched on the small parking light bulb flashes quickly and the larger indicator bulb does not work. Have replaced bulbs. Fuse is good. Cleaned all contacts. All other lights and electrics are fine.
Any ideas??
Thanks.

 

[Tifosi]

I don't suppose you checked and changed the rear bulbs did you?

High speed flashing is 98.2% of the time an indication of a blown/poor contacting bulb, though not neccisarily at the end of the car you might think.

 

[ga_mtn_spider]

Had same problem 2 nights ago on my 85. flip blinker on , lie down under front and find the light plug, Mine started working just by wiggling the plug, I then unplugged it cleaned up and smooooothered it in a healthy serving of dielectric grease.

 

[WindChill]

All rear bulbs are in good working order.

 

[Incompatible]

Do you have a multimeter?

Do you have a multimeter?
If so, check if you have 12VDC at the lightbulb socket.
(when the turnsignal is switched on of course)

If you do not have 12Volt DC (at the rythem of the turnsignal) move the black lead of the multimeter to a known good ground (a non rusted bolt, engine block, etc..)
Keep the red lead inside the lightbulb socket (bottom pin)
If the multimeter reads 12VDC, you just proved you had a bad ground.

Another way to check the ground is to switch OFF the turnsignal.
Switch your multimeter to OHMS (do not measure OHMS when there is power on the terminals!!!)
Switch to the smalest scale.
Put one lead of the multimeter to the ground terminal of the bulb-socket.
Put the other lead to a known GOOD ground.
You should read almost ZERO Ohms.

Good Luck

Marc