Question about 1981 Yamaha XS 400 Special

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Can't get aftermarket led turn signals to work on my 81 xs 400. Any way to bypass and make work?

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You will need to get a resistor for the lights as the Yamahas will not work/flash without the proper resistance in the bulbs. I had to stay stock on my XS650 for the same reason.

Posted on Mar 06, 2009

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Turn signal


You need a turn signal relay for LED flashers. Americansportbike.com sells one that works for what you need.

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How do I install my intergrated tail light with turn signals i got the tail light to work but the stock turn signals have about three wires each


The stock turn signals have 3 wires1) Positive for turn signal2) Positive for cruising light (comes on with the light switch's 1st click)3) Ground.Obviously you can either replace the entire turn signal with the aftermarket one and stop using the cruising light or bypass the positive wire for the turn signal only, to the aftermarket one, and leave the original turn signal with the cruising light only.

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Turn signal on one side dont work


sounds like a blown globe,,check and replace,,if the globe is ok,you need to inspect the wires from that indicator all the way,for loose connection,or frayed and shorting out somewhere.

Mar 23, 2011 | 1983 Yamaha XS 400 L Maxim

1 Answer

Need a wiring diagram for 81 xs 400


here is the full repair manual in PDF, and is printable. costly, but is a must have product......


http://www.tradebit.com/filedetail.php/9330080-yamaha-xs400-full-service-repair-manual-download

Jan 06, 2011 | 1981 Yamaha XS 400 Special

1 Answer

Turning signals dont blink they just stay on how do i get them to work right


Is this while the bike is running? If not, start it and see if they flash then. The old thermal flasher relays require more power to operate than newer electrical relays and won't function with just the battery, usually. If they still don't flash with the bike running, replace the flasher relay. Any automotive store will have something that should work, you don't have to go with an OEM part here. If you're feeling ambitious, you might replace the flasher bulbs with LEDs (I get mine from superbrightleds.com) and go with an electric (or electronic, I forget how they designate them) flasher unit. Less draw on your charging system and brighter.

Jul 01, 2010 | 1980 Yamaha XS 400 Special

1 Answer

Fast Turn Signals


I believe your aftermarket headlights have leds as your signal lights. They are now flashing faster because your electronic flasher module / unit is designed to measure current resistance to regulate the flash interval. As LED lights draw much less power than filament bulbs, the module thinks the lights are burnt out. Your hazards work on a timer to flash at intervals and does not work on the resistance.

You will need to replace the electronic flasher module / unit with one that is rated for LED. This unit should be under your dash near your steering column and will be labeled. The new one you replace it with should have LED stamped on it.

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Fuse box


It should be under the seat on top of the rear fender

Jul 10, 2009 | 1981 Yamaha XS 400 Special

1 Answer

Broke and missing kickstand


Take both bikes to a commercial welding shop. Let them remove the "new" side stand and weld it in place. Ask that they reinforce the mount bracket in the process. You should wind up with a VERY strong side stand, better than new. Be sure to clean the weld, prime and paint it also. Rust is a bad thing.

Please rate this answer. Thanks :)

May 26, 2009 | 1981 Yamaha XS 400 Special

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