Can someone design a circuit for me


Information and questions on GL1100 Goldwings (1980-1983)
Post Reply
johnny42
Posts: 116
Joined: Sun Apr 18, 2010 11:15 pm
Location: Lancaster, NY
Motorcycle: 1983 GL1100I Interstate (original owner)
2018 Royal Enfield Himalayan

Can someone design a circuit for me

Post by johnny42 »



I would like to build a new headlight circuit from scratch. I would use an on-off-on marine grade rocker switch. One "on" would be low beam, the other "on" would be high beam. I would use "off" when starting the bike. I would use a relay to get power to the headlamp. But that's just my idea. I do not know how exactly to wire this up and where and how to use a relay or whether I need a second relay. i would need to provide a power source to the on-off-on switch to power the relay(s). I don't think I could run this rocker switch with raw power, thus the relays. If someone could draw up a diagram, I would be eternally grateful.

Recap: On-off-on rocker switch to control the headlights bypassing the OEM controls. Getting power from the battery for the lights. Using relays so the on-off-on rocker switch merely powers the relays.



User avatar
AZgl1800
Posts: 2442
Joined: Thu Oct 30, 2008 2:46 pm
Location: Lake Oologah Indian Territory USA
Motorcycle: '02 GL1800
2009 Piaggio MP3 250cc

Re: Can someone design a circuit for me

Post by AZgl1800 »

not sure, but there should be an Oil Pressure switch that closes to Ground.

use a Relay and connect one side to the Accessory Terminal, and the other side to oil pressure switch terminal.

Use the contacts on the relay that are OPEN with the key turned ON, to supply power to the headlights.

this can be a Double Pole Relay or a special one that is stated to be OPEN until powered up.
e.g. the oil pressure has built up.
~John

'02 GL1800
2009 Piaggio MP3 250cc

User avatar
DenverWinger
Posts: 1555
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
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: Can someone design a circuit for me

Post by DenverWinger »

How about this - Takes two relays, one to kill headlights when starting, the other for Hi/Lo beam. Second relay needs to be 5 terminal relay.

Relay 1- Switches headlight on or off.
Terminal 30. Fused (7.5 A) power from battery.
Terminal 87. Switched battery power - send to Terminal 30 of next relay.
Relay Coil - Terminal 86 - Get power from engine "Kill" switch. Could use Accessory terminal, but then you'd have headlights on when Key is on "Acc", you only want headlight when key is "On"
Relay Coil - Terminal 85 - Connect to "M" terminal on Start relay, the main cable going to the starter motor. This will normally be ground (thru the starter) except when you hit the start button, then it will have battery voltage and cause this relay to kill the headlight when starting engine.

Could Connect Terminal 85 to oil pressure switch instead as AZgl1800 suggested, but you'd need to use a 5 terminal relay, your switched headlight power would come from Terminal 87a instead of 87, and headlights won't come on at all unless engine is running and Oil light is off.

Relay 2- 5 terminal relay. switches between hi and lo beam.
Terminal 30 - Switched battery power from Terminal 87 of first relay.
Terminal 87a Normally closed - send to headlight Low beam.
Terminal 87 Normally open - Send to headlight High beam.
Relay coil Terminal 86. Connect to Terminal 30 on this relay.
Relay Coil Terminal 85. Connect thru your rocker switch to Ground. Rocker switch controls relay, which switches between high and low beam.
♫ 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

Techdude2000
Posts: 321
Joined: Mon Jun 13, 2011 10:11 pm
Location: Lexington, KY
Motorcycle: 2004 GL1800

Re: Can someone design a circuit for me

Post by Techdude2000 »

I just wanted my headlights to stay off when starting the bike and since I usually start it on the side stand, I just cut the ground wire for the low beam relay and tied the ground wire from the side stand when it’s in the up position to the relay. This keeps the lights off until I put up the side stand and the lights won’t die if the engine dies. Not sure if this could work on older wings, but it works good on my 04. I know the starter switch kills the lights, but I think the on-off-on cycle adds to the wear and tear on the bulbs. This mod was thought up originally to keep the HID ballasts from short cycling. :D

User avatar
DenverWinger
Posts: 1555
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
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: Can someone design a circuit for me

Post by DenverWinger »

Sidestand switch would be a good idea except the 1100 doesn't have one.

+1 on not short-cycling HID lights, I think OP has standard bulb though.


♫ 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

Post Reply