Troubleshooting a brake relay

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u352

Member - Posts: 2

Joined: May 16, 2005

Location: United Kingdom

Posted: May 16, 2005 at 8:09 AM / IP Logged

My trucks brake light relay is attached to the master cylinder and before I disconnected it I wanted to test to see if that was the source of the problem. There are two leads going to the relay. If I jump the relays by connecting a wire to them should the brake lights come?

Thomasd

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Hornshockey

Silver - Posts: 520

Joined: January 31, 2005

Location: Texas, United States

Posted: May 16, 2005 at 5:47 PM / IP Logged

If there are only two leads running to it; it is most likely not a relay. More than likely just a momentary switch. One of the leads should read 12vdc all the time, and the other should read 12V when the brake pedal is depressed, This is probably the easiest way to test; but jumping the two leads accomplishes the same thing.

Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

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u352

Member - Posts: 2

Joined: May 16, 2005

Location: United Kingdom

Posted: May 17, 2005 at 6:58 AM / IP Logged

So if the jumper didn't illuminate the brakes then the problem is up stream. I tried to test the switch last night and when I depressed the brake pedal I got a reading with a meter(continuity) so I assume that the switch is good. Problem must be upstream. The saga continues so thanks for the help.

Thomasd

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Hornshockey

Silver - Posts: 520

Joined: January 31, 2005

Location: Texas, United States

Posted: May 17, 2005 at 11:21 AM / IP Logged

does one side of the switch have a constant 12V?

Life moves pretty fast; if you don't stop and look around once in a while; you could miss it.

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Troubleshooting a brake relay

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