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Old 11-28-2011
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Join Date: Nov 2011
Location: Merritt Island, FL
Posts: 1
Turn Signal/Taillight Problems

I have a 1994 Mazda B4000 that has been having some problems with the turn signals/brake lights/taillights. I have just replaced the multifunction switch (about 3 months ago). I have two flashers that I can switch out, one is a heavy duty. I replaced the bulbs in the left front and left rear turn signals, even though the old ones were working in the same manner as described here.

Here's what's going on:
With old flasher (not heavy duty):
Hazards: OK speed, but brake lights flashing too
Left Turn: too fast
Right Turn: very slow or always on
Brakes: rear turn signals illuminate with brakes, but don't flash; front turn signals do not illuminate
Brakes + Hazard: brakes and hazards always on (don't flash)
Brakes + Left Turn: brakes on; turn signal on, but doesn't flash
Brakes + Right Turn: brakes on; LEFT turn signal on, not flashing; right turn signal flashing slowly

With new flasher (heavy duty):
Same as with old flasher, except:
Left Turn: OK speed, but brake lights flashing too
Right Turn: OK

Sorry for the long post. I've looked for answers in other posts but wasn't really able to find anything.
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Old 11-28-2011
Join Date: Mar 2007
Location: Upstate,NY
Posts: 2,598
Bad grounds and rusted bulb sockets would be the most common problem on a vehicle of that age.
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Old 11-28-2011
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Location: SoCal
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I would also suggest checking your grounds for all of the lights, headlights too.

What did you change just before the trouble started ?

Any light bulb work, i.e. LEDs ?

Also, look at the connector for the Multi-function switch, sometimes the little tabs that hold the pins in the connector break off, maybe shorting.

Just thinking out loud.
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