Subject: Rear light unit not ok Wed Aug 24, 2022 3:44 pm
After turning ignition switch the rear light did not illuminate. Front light however did. After several attempts with the switch it worked but stopped when using brake.
measured 12volt in the plug for braking and normal light. It seems that my rear led light is on its way to GRiSO heaven.
Pulled on the wiring but no light. Cleaned the plug no result. Can't find anything that is related to my kind of issue. Seems like this does not happen verry often.
Sombody a suggestion?
New rear light costs 130 euro grrrr
Pete Roper GRiSO Capo
Posts : 9581 Join date : 2013-05-30 Age : 65
Subject: Re: Rear light unit not ok Wed Aug 24, 2022 4:11 pm
Yup, it sounds like it's gone and deaded itself. Being an LED light I imagine there is a transformer in it somewhere to step down the voltage. Chances are that has shat the bed. As you say, failures are rare, I think I've seen two since 2005, on Grisos at least. They do come up on fleabay from time to time but given how reliable they generally are perhaps it would be best to just buy one while they are still available and hope that it remains sound.
kiwi dave GRiSO Capo
Posts : 734 Join date : 2014-04-24 Age : 75
Subject: Re: Rear light unit not ok Thu Aug 25, 2022 1:10 am
The bulbs were all incandescent originally. The headlight was pathetic, so it was first to be replaced -I fitted an OSRAM 7" Round Black Led Headlight (105W).
Tail light is normally second to gain attention. It too was an incandescent duel filament bulb, which is usually replaced with a dual LED setup.
But losing both tail-lights at once is not common. Perhaps the common return wire has lost contact with the frame or battery negative. Simple check with a short piece of wire will determine if it has.
kiwi dave GRiSO Capo
Posts : 734 Join date : 2014-04-24 Age : 75
Subject: Re: Rear light unit not ok Thu Aug 25, 2022 1:12 am
Pete Roper wrote:
Yup, it sounds like it's gone and deaded itself. Being an LED light I imagine there is a transformer in it somewhere to step down the voltage
Sorry Pete, but transformers do not work in a direct current environment.
Pete Roper GRiSO Capo
Posts : 9581 Join date : 2013-05-30 Age : 65
Subject: Re: Rear light unit not ok Thu Aug 25, 2022 2:18 am
Cool. That's why I leave it up to clever people to answer technical electrical questions as a rule
Deepdive Carlotto
Posts : 48 Join date : 2020-02-29 Age : 57
Subject: Re: Rear light unit not ok Thu Aug 25, 2022 8:20 am
Will visit TLM today. Maybe they want to test the taillight. If failed, ill buy a new one. Sometimes the light will illuminate. After hitting the brake all fall out.
Deepdive Carlotto
Posts : 48 Join date : 2020-02-29 Age : 57
Subject: Re: Rear light unit not ok Thu Aug 25, 2022 10:21 am
Taillight start working . The mighty GRiSO repaired itself. Think the electrical spray did it´s job. (though i think the complaint will occur soon)
lcjohnny GRiSO Capo
Posts : 1282 Join date : 2016-01-26 Age : 67
Subject: Re: Rear light unit not ok Thu Aug 25, 2022 10:50 am
Deepdive wrote:
Taillight start working . The mighty GRiSO repaired itself. Think the electrical spray did it´s job. (though i think the complaint will occur soon)
This points to Kiwi-Dave's point about the "common return" or earth/ground wire.
If more than one electrical component is jointly wired in a plastic insulated box (like the rear light unit) then a poor or intermittent earth/ground connection for the whole unit means that one component may reach earth through the other component. so you get apparently weird effects
Check the earth return - blue wire
bjor likes this post
Deepdive Carlotto
Posts : 48 Join date : 2020-02-29 Age : 57
Subject: Re: Rear light unit not ok Thu Aug 25, 2022 3:05 pm
Indeed, Kiwi was right. The reason why i checked again this morning. Thanks ghetto.
eighteight Grignapoco
Posts : 141 Join date : 2022-02-24
Subject: Re: Rear light unit not ok Thu Aug 25, 2022 8:17 pm
Pete Roper wrote:
perhaps it would be best to just buy one while they are still available
Took that to heart and ordered one for the shelf
Deepdive Carlotto
Posts : 48 Join date : 2020-02-29 Age : 57
Subject: Re: Rear light unit not ok Tue Sep 20, 2022 7:18 pm
Complaint was intermittent. So bought new from TLM. Solved the issue. Seems like the taillight can be opened. Assume nobody ever did, cause normaly there´s no issue with the taillight´s of GRiSO[You must be registered and logged in to see this image.] .