Brake light, battery light and vacuum light all on?

1997 ISUZU NPR
125,000 MILES • 3.9L • TURBO • AUTOMATIC • DIESEL
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MERITSVC
Brake light, battery light and vacuum light all on. blower motor seemed to stop at the same time.
Blower motor seems to have voltage. alternator has been replaced. 14.4 volts to batteries from alternator.
local shop could not find source of problem.

thanks,
Gary
May 29, 2026 at 8:40 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,480 POSTS
  • ASE Certified Mechanic
Hi Gary, I would check the fuses and fusible links/main system fuses in the truck first, this video will help you

https://www.youtube.com/watch?v=G-xNK79Wa-w

Please go over this guide as well

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

Check the main fuse panel fuses first. Let me know how it goes.
May 31, 2026 at 4:27 PM
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