Turn signals, brake lights and A/C stopped working

Tiny
THURMG70
  • MEMBER
  • 1995 MAZDA PROTEGE
  • 1.5L
  • 4 CYL
  • 2WD
  • MANUAL
  • 300,000 MILES
I have lost my turn signals, brake lights, air-conditioning. Is there a common relationship between the turn signal switch these fused systems? Also the interior box (engine)fuse 10a, and radio after market no service. What happened? Checked majority.
Saturday, September 18th, 2021 AT 8:49 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,192 POSTS
Hi,

I went through the power distribution schematics and found a few things. First, you indicated there is no power to the eng fuse in the vehicle. Power to that fuse comes from a 60 amp btn fuse in the main fuse box. The btn fuse and ignition switch fuse receive power from the 80amp main fuse in the main fuse box. The ignition switch is powered by a 50 amp fuse in the main fuse box as well.

If you lose power from the fuse, you also lose power to basically everything you mentioned plus other things. Do me a favor. Start at the main 80 amp fuse in the main fuse box. Check it for power as well. If it is good, then check the ignition fuse and the btn fuse in the same box. I can't be certain, but I suspect the main 80 amp fuse is bad.

I attached the wiring schematic below of the power distribution system. Take a look at it and let me know your thoughts.

When you check fuses, first check the fuse and connections. If they are good, confirm there is power to and from it.

Here is a link you may find helpful.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know what you find or if you have other questions.

Take care,

Joe

See pics below. Note: I had to cut the schematic in half to make it readable for you. I did, however, overlap them so you can follow from one to the next.
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Saturday, September 18th, 2021 AT 10:14 PM

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