Brake Light Modulator


Information and questions on GL1500 Goldwings (1988-2000)
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DougEFresh1123
Posts: 141
Joined: Mon Aug 27, 2018 10:22 am
Location: Villa Park, IL
Motorcycle: 2002 Honda Magna VF750
1994 GL1500SE

Brake Light Modulator

Post by DougEFresh1123 » Tue Apr 16, 2019 1:31 pm



In my haste to get the 'Wing back together I ignored the fact the brake lights were blinking whenever I turned the bike on and now I'm afraid I'm going to need to take it all apart to find the cause of this problem.

Here is what I know:

The PO didn't have the modulator installed but has stated the trunk brake lights are supposed to blink three times when the brakes are applied and then go to solid and the saddlebag lights are just regular brake lights.

It also appears the saddlebag lights are only functioning as running lights. Now it is possible both saddlebag brake lights have burnt out, or were replaced with single element bulbs for some odd reason. Guess I'll figure this part out when I remove the lights and check them.

I am ruling out the brake light switch, because the lights should change to solid after a few blinks but they continue to blink even after the brake is applied, which is why I'm thinking it is the modulator being faulty. If my hunch is correct which wire should I follow to find the modulator? According to the wiring diagram my choices are Brown; Solid Green; or Green/Yellow. If I'm wrong how should I proceed?

Oh by the way what I lack in mechanical skills I make up for with double dose of electrical ineptitude. Which means this part of the project will be even more challenging than the winter maintenance project.

Thanks - Doug


'02 Magna VF750
'96 GL1500SE
- Doug

“We must reject the idea that every time a law's broken, society is guilty rather than the lawbreaker. It is time to restore the American precept that each individual is accountable for his actions.”
― Ronald Reagan

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Andy Cote
Posts: 220
Joined: Sun Feb 27, 2011 11:38 am
Location: Windham, ME
Motorcycle: 2015 Goldwing, basic black

Re: Brake Light Modulator

Post by Andy Cote » Tue Apr 16, 2019 1:48 pm

First, may seem to be a nitpick but brake lights have flashers not modulators. A modulator reduces from full power to partial power and is inactive in low light. Brake light flashers do not have this capability. Important to keep the nomenclature correct to help people understand what headlight modulators do and why they are legal.

First thing, like everything on the GL1500, is to pull the seat and look for things that don't look original.

OEM GL1500 has two brake light bulbs in the trunk and two lower on the rear of the saddlebags as you describe. Sounds as if a flasher has been added after the cable splits for trunk and bags. Most likely place is inside the cover on the bottom of the trunk where the release levers and the helmet hooks are. There are about 10+/- screws that go up from the bottom that hold this cover on. Most likely there is a rat's nest of ten different owner's changes to the wiring.

The lights are not too hard to get out so it might be worth checking those bulbs first but sounds like you want to pull the flasher anyway so that will take some searching to find.
DARKSIDE #1500
2018 Goldwing, basic black

Previously: GL1200 standard, GL1200 Interstate, GL1500 Goldwing, GL1500 Valkyrie Standard, 2000 Valkyrie Interstate, many other Hondas

Ham Extra Class, AC1R

User avatar
DougEFresh1123
Posts: 141
Joined: Mon Aug 27, 2018 10:22 am
Location: Villa Park, IL
Motorcycle: 2002 Honda Magna VF750
1994 GL1500SE

Re: Brake Light Modulator

Post by DougEFresh1123 » Tue Apr 16, 2019 2:06 pm

Andy Cote wrote:
Tue Apr 16, 2019 1:48 pm
First, may seem to be a nitpick but brake lights have flashers not modulators. A modulator reduces from full power to partial power and is inactive in low light. Brake light flashers do not have this capability. Important to keep the nomenclature correct to help people understand what headlight modulators do and why they are legal.
Thank you for the correction/clarification.

First thing, like everything on the GL1500, is to pull the seat and look for things that don't look original.
The only thing that didn't look original was the wiring for the nice little green lights a way back previous owner added. I did trace those wires they are black and red and much smaller than the wires for the brake lights and never intersect with the brake light wiring.
OEM GL1500 has two brake light bulbs in the trunk and two lower on the rear of the saddlebags as you describe. Sounds as if a flasher has been added after the cable splits for trunk and bags. Most likely place is inside the cover on the bottom of the trunk where the release levers and the helmet hooks are. There are about 10+/- screws that go up from the bottom that hold this cover on. Most likely there is a rat's nest of ten different owner's changes to the wiring.


Thank you I will look in this area and let you know what I find.
The lights are not too hard to get out so it might be worth checking those bulbs first but sounds like you want to pull the flasher anyway so that will take some searching to find.
I have already pulled the lights from the trunk and both filaments are fine, haven't gotten to the saddlebag lights yet.
Attachments

The yellow circle area has a small fuse box? for the add on lights.  I don't think these are involved with the brake but it might be.
The yellow circle area has a small fuse box? for the add on lights. I don't think these are involved with the brake but it might be.

'02 Magna VF750
'96 GL1500SE
- Doug

“We must reject the idea that every time a law's broken, society is guilty rather than the lawbreaker. It is time to restore the American precept that each individual is accountable for his actions.”
― Ronald Reagan

User avatar
DougEFresh1123
Posts: 141
Joined: Mon Aug 27, 2018 10:22 am
Location: Villa Park, IL
Motorcycle: 2002 Honda Magna VF750
1994 GL1500SE

Re: Brake Light Modulator

Post by DougEFresh1123 » Wed Apr 17, 2019 9:09 am

Andy Cote wrote:
Tue Apr 16, 2019 1:48 pm
OEM GL1500 has two brake light bulbs in the trunk and two lower on the rear of the saddlebags as you describe. Sounds as if a flasher has been added after the cable splits for trunk and bags. Most likely place is inside the cover on the bottom of the trunk where the release levers and the helmet hooks are. There are about 10+/- screws that go up from the bottom that hold this cover on. Most likely there is a rat's nest of ten different owner's changes to the wiring.
Andy I'm confused :? . Not to hard to do so don't feel bad :lol: . The release levers are these the ones to release the helmet hooks or the release levers to open the trunk and saddlebags?

I'm looking at the outside bottom trunk cover and only see 4 recessed screws, are there more hidden by the saddlebags, or am I working from inside the trunk?

Thanks - Doug
'02 Magna VF750
'96 GL1500SE
- Doug

“We must reject the idea that every time a law's broken, society is guilty rather than the lawbreaker. It is time to restore the American precept that each individual is accountable for his actions.”
― Ronald Reagan

User avatar
Andy Cote
Posts: 220
Joined: Sun Feb 27, 2011 11:38 am
Location: Windham, ME
Motorcycle: 2015 Goldwing, basic black

Re: Brake Light Modulator

Post by Andy Cote » Wed Apr 17, 2019 5:32 pm

So, memory is the second thing to go. Seem to remember more than four.

You were in the right place looking up at the levers for the trunk and saddlebags, above the license plate, they are in those recessed holes and have JIS/phillips screws. Those screws are uncooperative going back in BTW. Also the front end of this cover has two tabs that slide forward so once the screws are out, pull it down and then back to take it off.
DARKSIDE #1500
2018 Goldwing, basic black

Previously: GL1200 standard, GL1200 Interstate, GL1500 Goldwing, GL1500 Valkyrie Standard, 2000 Valkyrie Interstate, many other Hondas

Ham Extra Class, AC1R

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DenverWinger
Posts: 683
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Location: Denver, CO
Motorcycle: 1980 GL1100 STD Vetter (2005-)
1993 GL1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
1977 GL1000 (2002-2006) sold

Re: Brake Light Modulator

Post by DenverWinger » Wed Apr 17, 2019 5:40 pm

There's only four. :)
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

User avatar
DougEFresh1123
Posts: 141
Joined: Mon Aug 27, 2018 10:22 am
Location: Villa Park, IL
Motorcycle: 2002 Honda Magna VF750
1994 GL1500SE

Re: Brake Light Modulator

Post by DougEFresh1123 » Wed Apr 17, 2019 9:57 pm

Andy Cote wrote:
Wed Apr 17, 2019 5:32 pm
So, memory is the second thing to go. Seem to remember more than four.

You were in the right place looking up at the levers for the trunk and saddlebags, above the license plate, they are in those recessed holes and have JIS/phillips screws. Those screws are uncooperative going back in BTW. Also the front end of this cover has two tabs that slide forward so once the screws are out, pull it down and then back to take it off.
Is hearing the first? My wife ways says I told you and I say I didn’t hear you. :D.
What where we talking about?

Got it, remove the outside trunk cover, pull out the flasher and swear numerous times while replacing the screws. :lol:
Thanks -Doug


'02 Magna VF750
'96 GL1500SE
- Doug

“We must reject the idea that every time a law's broken, society is guilty rather than the lawbreaker. It is time to restore the American precept that each individual is accountable for his actions.”
― Ronald Reagan

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