Brake fuse blow when pressing the brake pedal

1997 CHEVROLET ASTRO
213,000 MILES • 4.3L • 6 CYL • 4WD • AUTOMATIC
Avatar
HANDYDOUG13
  • MEMBER
  • 5 POSTS
I have a ohmmeter on the stop hazard fuse and checking for continuity. there is a short when pushing the brake pedal only when the ignition is on. The turn signals don't work either.
Nov 1, 2020 at 3:00 AM
Advertisement
Avatar
ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good afternoon,

I attached a wiring diagram for you to view. The first thing I would do is disconnect the turn signal switch connectors under the dash and see if the fuse still fails.

https://www.2carpros.com/articles/how-to-check-wiring

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

Keep me updated with the results.

Roy
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Nov 1, 2020 at 5:06 AM
Avatar
HANDYDOUG13
  • MEMBER
  • 5 POSTS
Hello Roy, thank you for that information. I haven't been able to check that out yet. I did find that the left front outer turn signal bulb is burned out. Could that be possible cause? Thanks,
Doug
Nov 1, 2020 at 5:18 AM
Avatar
ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Possible but I doubt it.

Remove the bulb and then re test and see if the fuse still fails.

Roy
Nov 1, 2020 at 5:28 AM
Avatar
HANDYDOUG13
  • MEMBER
  • 5 POSTS
I have to go get some fuses. The turn signals work now though. I'll let you know what the results are.
Thank you so much!
Doug
Nov 1, 2020 at 5:42 AM
Avatar
ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
You are welcome.

Always glad to help.

Roy
Nov 1, 2020 at 5:59 AM
Avatar
HANDYDOUG13
  • MEMBER
  • 5 POSTS
Thanks for your help. So far, the brake lights fuse has not blown after putting the new left front outer turn signal bulb in.
Nov 1, 2020 at 8:51 AM
Avatar
ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good. I would replace the bulb and socket if it is damaged

Roy
Nov 1, 2020 at 9:44 AM
Avatar
HANDYDOUG13
  • MEMBER
  • 5 POSTS
Thanks, I will check it. Thank you for your help!
Doug
Nov 1, 2020 at 9:48 AM
Avatar
ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Stay safe.

You are welcome.

Always glad to help.

Roy
Nov 1, 2020 at 7:08 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.