1999 Mazda 626 fuses/lights

Tiny
CONFUSEDABOUTALL
  • MEMBER
  • 1999 MAZDA 626
My 1999 626 Mazda keep blowing fuses. I have replaced the same two back to back. The dashboard, tail light, and break light fuse. What can make that happen? Also when I push my break the park lights and dash lights come on. What can be the problem?? CAN ANY ONE HELP ME?
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Wednesday, June 4th, 2014 AT 11:33 PM

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Tiny
CARADIODOC
  • EXPERT
The dash lights feed off the tail light circuit, and the tail light and brake light circuits are shorted together. There's two common causes of that. One is a trailer harness that is chewed up and some wires are touching. The other is the wrong light bulb in the rear. An 1157 brake / tail light bulb has two contacts on the bottom. An 1156 has one contact that will short the two circuits together if it's placed in an 1157 socket. Most cars went to bulbs with plastic bases that can't have the wrong one installed, so that leaves the trailer harness. There's also a ground wire in a trailer harness, and bare wires touching that one would cause a fuse to blow.

If you don't have a trailer harness, inspect the wiring inside the trunk. Look for any wires that are chewed up or have bare spots.
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Thursday, June 5th, 2014 AT 1:13 AM
Tiny
CONFUSEDABOUTALL
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Thank you I will look into it. Is this also what will cause my dash lights to come on when I push the break?
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Thursday, June 5th, 2014 AT 7:41 PM
Tiny
CARADIODOC
  • EXPERT
If the tail light and brake light circuits are shorted together, then yes. The dash lights feed off the tail light circuit at the head light switch, so by being shorted together, when you apply the brakes, the current goes to the tail light circuit which powers the dash lights. If you have an original radio, you'll see the display dim too.
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Thursday, June 5th, 2014 AT 9:24 PM

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