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Offline barbarossa

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Low beam headlight
« on: October 09, 2017, 10:54:09 AM »
Some time ago I had only one bulb working in the headlight, normally it is two. I tested high beam, both working.
After a stop there was working both lights again. Last saturday both were not working, both high beams did however.
My first idea was changing both the bulbs. To my suroris yesterday, (sunday) one was working.
This morning no light. I suppose it is a relais, fuses are ok. But how can I find out which relais it can be. I pulled them all out and checked for moist and dirt but it looks ok.
Can anybody recognize this problem and knows how to solve it?

Offline Coconut

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Re: Low beam headlight
« Reply #1 on: October 10, 2017, 09:51:07 PM »
Hi barbarossa,

Apologies for not replying sooner -  :164:
I haven't had chance to study the wiring diagram until now !

It won't be an issue with the Headlamp Relay, as that provides the power
into the Dipped Beam / Main Beam switch, and if the Relay failed
then both Dipped and Main beam would not work !

I'd start with new bulbs, or at least test them with a Meter to make sure they are working,
and also check that the connections to them are clean and tight.

The symptoms you describe could be a problem with the left handlebar switch-
which changes over from Dipped Beam to Main Beam, but that might not explain
why sometimes only one of the two bulbs works.

It's possible you have a faulty bulb ( or two ! ) AND dirty contacts in the switch !

After checking / testing the bulbs, I'd remove the switch cube,
clean the contacts and apply some electrical grease.

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Offline barbarossa

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Re: Low beam headlight
« Reply #2 on: October 12, 2017, 04:18:21 PM »

Thank you Coconut. Your first impression was the best one, both bulbs are finished, new ones working alrerady.
But I wonder why constructors make it so awfully difficult, almost impossible to change them.
Anyway, the problem is solved, cost me half a day. Thankls again.
Do not feel guilty for not answering right away, life is more than motorcycles, they just make it more bearable.

Offline Coconut

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Re: Low beam headlight
« Reply #3 on: October 12, 2017, 04:53:04 PM »
Do not feel guilty for not answering right away,

Guilty ? !

OK - I won't - Not much chance of me ever feeling like that !

Glad you got  the problem resolved  :028:


If you feel I've helped you, and you would like to show appreciation, donations to
my Granddaughters Fundraising event in support of a Children's Cancer Charity,
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Offline SprintST1050

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Re: Low beam headlight
« Reply #4 on: October 13, 2017, 12:12:42 PM »
I'm reminded of a similar issue I had with my Mustang's tail lamps.  Removed bulbs, cleaned contacts and problem cleared up.  I've only ridden my Trophy once at night and found out the headlamps were a bit high.  Will be breaking out the manual to operate the powered adjustment to bring them down a bit.  Sprint is a different animal.  Main beam is useless except for flashing warnings.  Dipped beam aiming is critical to get the correct balance without blinding opposing traffic.  Looking forward to the powered adjustment.
Other Current Bike: '08 Sprint ST ABS

Offline rpeters549

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Re: Low beam headlight
« Reply #5 on: October 13, 2017, 06:53:19 PM »
*Originally Posted by barbarossa [+]
But I wonder why constructors make it so awfully difficult, almost impossible to change them.
Anyway, the problem is solved, cost me half a day. Thankls again.

I am a couple hundred miles from my 10k service.  Planning to replace the stockers with some SilverStar bulbs while I have it dismantled.  Figure it might be a little easier with the bike taken half way apart.
Year round rider here!