97 900 SS brake light prob - Ducati.ms - The Ultimate Ducati Forum
 
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post #1 of 6 (permalink) Old Apr 11th, 2019, 9:10 pm Thread Starter
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97 900 SS brake light prob

G'day,

New to membership, but have read forum advice for years as I have owned a 97 900SS from new. Spent way too much on it, but love it and my boy will inherit it. Anyway, have a prob with the front brake operated brake light....not working. Rear brake is activating the tail light. Have shorted the wires at the front switch, still no go. Had a rough check of wiring integrity without luck also. Not much good with multi-meter stuff. Any ideas??

Cheers

Bill
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post #2 of 6 (permalink) Old Apr 11th, 2019, 11:47 pm
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Hi Bill and welcome. Is there a small plunger that actuates your brake light? I have had to clean and lubricate that on several motorcycles in the past.

Scott
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'03 Ducati ST4S with ABS - '12 KTM 500EXC - '19 BMW R1250GSA
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post #3 of 6 (permalink) Old Apr 12th, 2019, 1:53 am Thread Starter
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Hi and thanks Scott,

No plunger that I'm aware of , there's a tiny switch at the end of the front brake lever, but I bypassed that and still no go.

One of those annoying probs that Dukes are renowned for...

Cheers

Bill
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post #4 of 6 (permalink) Old Apr 12th, 2019, 7:31 am
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From time to time I go over the bike and unplug every electrical connector and rub the contacts with wd40 or such, checking for corrosion, and push the wires from each side back into the connectors. The factory sometimes puts zip ties too close to connectors , pulling on the wires enough to cause poor contact. If it looks dodgy in any way I fix it or replace it.

'96 Ducati SS900CR, '07 S4RS, '06 Busa, '77 Bonny,
'00 Superglide, '85 Sportster, '78 SR500
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post #5 of 6 (permalink) Old Apr 12th, 2019, 7:58 am
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If you are saying you shorted the two connectors at the switch (harness side) and did not have it work I would guess you may have the switch wires right at the master. Fiollow those wiress down to the steering head area (right side) and you should see them connect to the harness with 2 bullet connectors. With key on and wires disconnected you should be able to turn the brake light on by shorting these 2 harness side connectors. If not you may have a broken wire as it is the same circuit front and rear and you said the rear is working.

Harness issues are very rare on these bikes so odds are it is in the front brake switch or sub harness for the front brake switch. Also make sure no one changed the brake lever and lost the little black actuating puck that is only held in place by being trapped between the lever and switch. Do you have the switch with 2 wires built into it and about a foot of wire? Or the early switch that just has 2 male connectors right on the switch? Switches do fail and can be out of adjustment so before buying new figure out if it...

1. is the switch.
2. the switch just needs to be adjusted
3. someone lost the puck
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post #6 of 6 (permalink) Old Apr 12th, 2019, 10:53 am
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I copied this thread over to the Supersport forum for more eyes and help:
https://www.ducati.ms/forums/57-supe...ight-prob.html

Scott
Sacramento CA

'03 Ducati ST4S with ABS - '12 KTM 500EXC - '19 BMW R1250GSA
(Jessica Focker's) '15 BMW S1000RR - '17 KTM 350EXC-F - '09 Yamaha XT250


Some of the most asinine things people do are typically preceded by the two words "Watch this."
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