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1991 Lexus LS 400 electrical

Tiny
SHELTONG877
  • MEMBER
  • 1991 LEXUS LS 400
  • V8
  • FWD
  • AUTOMATIC
  • 200,000 MILES
I'll put a fuse in for my dashboard lights and they blow what do you think the problem is
Wednesday, February 26th, 2014 AT 7:08 PM

4 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Something is shorted and drawing too much current. Do you have an aftermarket radio?
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Wednesday, February 26th, 2014 AT 9:28 PM
Tiny
SHELTONG877
  • MEMBER
  • 3 POSTS
Only factory
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Wednesday, February 26th, 2014 AT 9:50 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,916 POSTS
Do the tail lights work? If they don't, that's the circuit to diagnose.

A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.
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Wednesday, February 26th, 2014 AT 10:07 PM
Tiny
SHELTONG877
  • MEMBER
  • 3 POSTS
Yes
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Wednesday, February 26th, 2014 AT 10:13 PM

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