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Old 08-04-2011, 07:08 PM
vintagemcyclegu vintagemcyclegu is offline
Join Date: Sep 2010
Location: Michigan
Posts: 32
Headlight died 80 XS1100

Headlight was working and now is not. Checked fuse is good. Where is the relay for the headlight. Or is there any know problems with the system. Thanks.
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Old 08-04-2011, 07:10 PM
vintagemcyclegu vintagemcyclegu is offline
Join Date: Sep 2010
Location: Michigan
Posts: 32
Headlight problem

Forgot to mention that I changed out the headlight also.
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Old 08-04-2011, 07:28 PM
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bikerphil bikerphil is offline
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Location: Broward County, S. Flori-DUH
Posts: 7,552
Relay is located by the ign. coils under the fuel tank. If you unplug the 4 wire connector and jump the red/yel and blu/blk wires, you will bypass the relay and the light should come on with the key on. A bad charging system will prevent the headlight relay from latching also.

79F - owned since '89 - FJ fork mod, solo seat mod, Dyna 3Ω's, 14MM M/C (168K miles)
79SF - every day rider, solo seat mod, Brembo 16MM M/C, Accel 3Ω's, Supertrapp (125K miles)

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Old 08-04-2011, 07:35 PM
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cywelchjr cywelchjr is offline
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Join Date: Oct 2008
Location: Sacramento, CA
Posts: 4,450
Is the tach working? Check to make sure that the charging system is working, as that can be one of the first signs that it's not working, the headlight not coming on. If the charging system is working, then the things to check are in this order:

1. Headlight (you did already)
2. Headlight relay (on the frame rails in front of the coils I believe this thread here tells how to bypass http://www.xs11.com/forum/showthread.php?t=33468 )
3. RLU see above referenced thread on how to bypass to test.

if headlight relay test shows bad, then before deciding it's the relay, find and check the diode in the wire harness up between the coils. It's what triggers the relay and if it goes bad the relay even if good won't trigger anymore. If it's bad, any 14 volt or better 2 amp or better diode can replace it, just make sure it's pointing the right way, it's NLA from Yamaha anymore so you have to get one from the local electronic store.

1980 XS1100G (Brutus) w/81H Engine
Duplicolor Mirage Paint Job (Purple/Green)
Vetter Windjammer IV
Vetter hard bags & Trunk
OEM Luggage Rack
Jardine Spaghetti 4-2 exhaust system
Spade Fuse Box
Turn Signal Auto Cancel Mod
750 FD Mod
TC Spin on Oil Filter Adapter (temp removed)
XJ1100 Front Footpegs
XJ1100 Shocks

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Old 08-05-2011, 10:14 PM
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oldyam80sg oldyam80sg is offline
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Join Date: Apr 2007
Location: Hackettstown , New Jersey
Posts: 1,538
On my 80 SG there is a diode in the harness under the seat area on left side.If that goes no light!
1980 XS1100 SG
Inline fuel filters
New wires in old coils-outer spark plugs
160 mph speedometer mod
Kerker Exhaust
xschop K & N air filter setup
Dynojet Recalibration kit
1999 Kawasaki ZRX1100
1997 Jeep Cherokee 4.5"lift installed
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