Jump to content

Wire Harness Dilemma


drfeelgood824
This post is 5294 days old and we'd rather you create a new post instead of adding to this one. You can't reply in this post.

Recommended Posts

The wire harness for this bike has been chopped and spliced for a few rounds. I managed to get the harness to what I thought was 100%, however here is the problem:

Problem:

With key in the ignition, the rear brake light is constantly illuminated.

And when I select the right or left rear flashers, from the handle bar switch, both right and left signal indicators have low illumination, if any at all and the rear tail light pulsates.

Here is a link to a video of it happening:

My theory:

Now all the lines match, strand for stand. I retraced the lines for continuous match of color code for a second time. There are two brown lines, I noticed that Yamaha designated on this bike. The dark brown lines belongs to one of the turn signals; Dark green is the other signal color. The lighter brown, which I'll identify as TAN, is the power line that delivers power throughout the bike. Now I thought that the brown and tan lines were simply misconnected, but they do not appear to be this way. The bike starts easily, and shuts off with both the key and emergency kill switch.

But what also doesn't currently work is the horn. I was able to test it with a 12 volt direct connection, and i know it it works.

Now the wire harness within the headlight enclosure are just "plug and play." So there doesn't seem to be a mix up at all going on up there.

Here is a link to the wire diagram that I'm currently using. Please discard my original tracing colors.

So, any ideas?

And here are some of the picture of the open wire harness.

1978_wire_harness_1.jpg

1978_Dt250E_wire_001.JPG

1978_Dt250E_wire_002.JPG

1978_Dt250E_wire_003.JPG

1978_Dt250E_wire_004.JPG

Link to comment
Share on other sites

Do you want an ad-free experience? Join today and help support the Yamaha Owners Club.

Hiya,

For the brakelight check the front and rear switches which may be broken or out of adjustment, causing the light to come on all the time. Normal that it dims with the indicators on without the engine running. Are the rear indicators connected as thety weren't working with the front?

For the horn, check that the wiring is getting power with a voltmeter. Might be a dirty connector or in the switch itself.

Hope that helps,

Gordo

Link to comment
Share on other sites

I must have popped the fuse... I lost all power now to bike.

I just found a used wire harness on ebay, listed as in good shape for a '79 DT250. According the manual, this should definitely work.

I'm still gonna be working on the one that is currently on the bike. I'll let you know where I end up. Thanks for the advice.

Link to comment
Share on other sites

  • Who's Online (See full list)

    • There are no registered users currently online
  • Recently Browsing

    • No registered users viewing this page.
×
×
  • Create New...