1999 Mazda 626 No tail lights

Tiny
TRIZELL
  • MEMBER
  • 1999 MAZDA 626
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 148,000 MILES
I have all lights but no tail lights or tag lights. I checked the fuse and the TNS relay, they both were good. I grabbed another headlight/multi function switch, all lights worked except to the tail and tag lights. Is this a broken wire?
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Tuesday, January 27th, 2015 AT 4:11 PM

7 Replies

Tiny
CARADIODOC
  • EXPERT
Do you have a voltmeter or test light and know how to use it? Do the front running lights work? When you had the head light switch out, did you see any blackened or melted spots on the switch terminals or the connector plug?
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Tuesday, January 27th, 2015 AT 6:00 PM
Tiny
TRIZELL
  • MEMBER
Yes I have a volt meter but I'm not so familiar wit using it. But I do own a test light. Yes the front running lights work, and there were no burn marks on the switch period. I even smelled for burning on the inside of the switch.
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Wednesday, January 28th, 2015 AT 5:52 AM
Tiny
CARADIODOC
  • EXPERT
Dandy. I think this is going to be an easy diagnosis. There's a joint connector where the front and rear circuits split off. We know it's okay up to there since the front lights work. A white / red wire goes to all of the rear tail lights, and those and the license lamps all share a common ground wire. Chances are the ground wire is corroded off or got hit by something. It's bolted to the sheet metal at the center, front of the trunk. Check that wire first.

If the ground wire appears to be okay, turn on just the running lights, then use your voltmeter or test light to check for voltage on every terminal on one of the tail light bulbs. There must be at least one with 0.0 volts. If every terminal has some voltage, there's a break in the ground wire. If none of them have 12 volts, there's a break in the white / red wire.
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Thursday, January 29th, 2015 AT 9:42 AM
Tiny
TRIZELL
  • MEMBER
Problem solved! It was the red/white wire broken right at the connector! Thanks for all the help! It is greatly appreciated!
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Thursday, January 29th, 2015 AT 12:26 PM
Tiny
CARADIODOC
  • EXPERT
Dandy! One in a row. Happy to hear it's solved.
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Thursday, January 29th, 2015 AT 12:31 PM
Tiny
TOM EILERTSEN
  • MEMBER
Where is this connector located?
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Monday, November 13th, 2017 AT 2:29 PM
Tiny
CARADIODOC
  • EXPERT
That connector is listed as the "joint box", behind the left side of the dash. Three white / red wires come off of it. Two are for the two front lights. One is for all of the rear lights. If the front lights work, the circuit has to be okay up to that connector. The wire going to the rear splits into three wires, but the location of that splice is not listed.
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Monday, November 13th, 2017 AT 5:40 PM

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