Question about 1992 Saab 900

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My 92 saab third brakelight is on and the brake lights aren't working,i've checked most everything ,bulbs,ground,wiring for crushing/fraying,switch with an ohmeter,

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  • Saab Master
  • 19,396 Answers

Hi.

It looks like a broken wiring.

Use the Ohm meter to test continuity and find out where the wiring is broken. Read Ohms between switch at the pedal and fuse box back plate, and between fuse box and bulb contacts. Alternatively use a test light to read volts with pedal pushed. Those are the only easy ways to find out a broken wiring.

If there are volts at bulb, then check the bulb, ensure that you are using the right one, and check connection at lamp holder.

Posted on Aug 04, 2010

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  • Master
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Here are a couple of things to try. Remove the bulb and clean the bulb socket with the eraser on the end of a common pencil. Also clean the bulb.

Change the fuse even if it looks good as they sometimes trick you.

Trace the ground wire and disconnect it from the frame. Use emery cloth to clean the spot where the ground meets the frame. Clean the end of the wire and then reconnect it all. J.

Posted on Aug 03, 2010

  • lamontjkrans Aug 03, 2010

    nice suggestions but all have been tried bulbs replaced,ground cleaned,power shws on the taillight red wire but tracing it to bulb doesn't show power but more important it shouldn't be showing any power at the third light without the pedal down.

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Posted on Jan 02, 2017

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