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post #1 of 12 Old 03-31-2011, 06:14 PM Thread Starter
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Angry front brake light switch

My front brake does not activate the rear brake light. I have continuity in the switch when open and none when closed. So the switch seems ok. I have from the black wire that connects to one of the spades on the switch. I have replaced the switch with a new one just in case, still no rear brake light. The switch is installed properly and the adjustment on the lever is fine. What am I missing.
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post #2 of 12 Old 03-31-2011, 06:29 PM
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I'd grab a multimeter and chase wires from RoberTx's excellent '08-and-later wiring diagram (accessible from Google).

Aw, why make you work that hard?

Check Post # 4, here:

http://www.advrider.com/forums/showthread.php?t=614276

Last edited by Damocles; 03-31-2011 at 06:33 PM.
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post #3 of 12 Old 03-31-2011, 06:56 PM Thread Starter
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Thanks for the heads up. Does the symbol that looks like a pitch fork represent ground?
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post #4 of 12 Old 03-31-2011, 07:15 PM
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Thanks for the heads up. Does the symbol that looks like a pitch fork represent ground?
Aye, lad; that it does!

Or, "earth," if you prefer!
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post #5 of 12 Old 04-01-2011, 10:13 AM Thread Starter
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For those who have had the same issue, how did you resolve the problem.
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post #6 of 12 Old 04-01-2011, 10:45 AM
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Ain't had the problem, but . . . I'd take a voltmeter and see if + 12 volts DC appears on the "hot" side of the switch with ignition key on.

Next, I might take an ohm-meter and see if the ground side of the switch actually connexts with ground.

Next, I'd probably disconnect the hot side of the switch, connect an ohm-meter to both sides of the switch, and see if continuity exists when brake pressure is applied, and if continuity is broken when brake pressure is released.

With all these tests "positive," I'd reconnect the brake switch and expect voltage at the brake light when ignition switch is on and brake energized.

Still no brake light? Then, I might check the brake light wiring and brake light bulb filament . . .

Good luck!
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post #7 of 12 Old 04-01-2011, 10:50 AM
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Quote:
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... I have from the black wire that connects to one of the spades on the switch. ...
byker, dude-

The above is an incomplete sentence and leaves us wondering what you have from the black wire. Continuity?

That black wire should have continuity (short, zero resistance) to ground.

The Blue and White wire should have continuity back to the rear socket.

Unplug both wires from the switch. Remove the bulb from the brake/tail socket.

Check that the black wire is a good ground. Check that the blue/white wire has continuity from the switch to the contact in the bulb socket.

You imply that the brake light is activated by the foot brake, so there should be no continuity issues with the bulb itself or the ground (black/yellow) coming out of the socket. You could check it, just to be sure.

Electrical gremlins are a pain. Let us know how it turns out.

T

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post #8 of 12 Old 04-01-2011, 05:23 PM Thread Starter
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Thanks Tom. I wil dig into it in the morning. The brake light does work when activated by the foot brake.

Last edited by byker; 04-01-2011 at 05:25 PM.
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post #9 of 12 Old 04-01-2011, 05:28 PM
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byker -

Let us know how you make out!

T

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The kid poured him another straight rye and I think he doctored it with water down behind the bar because when he came up with it he looked as guilty as if he'd kicked his grandmother. -Philip Marlowe

'Why' and 'How' are words so important they cannot be too often used. -Napoleon Bonaparte

Sting like a butterfly.
Noli Timere Messorem
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post #10 of 12 Old 04-01-2011, 05:41 PM
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Thanks Tom. I wil dig into it in the morning. The brake light does work when activated by the foot brake.
Then, just a conjecture, but . . . I believe you have isolated the problem to either:

1. Absence of + 12 VDC at hot side of brake light switch.
2. Defective brake light switch (i.e., does not close when hydraulic pressure is applied).

or,

3. Open circuit in wiring between brake light switch and tail light bulb recptacle.
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