facebook1 youtube1 twitter1 instagram linkedin1 pinterest1

NOTICE:  If you are not a free registered member of the site, you will not see the photos in the forum, and you won't be able to access our premium member content. Please consider joining our community! REGISTER AND MAKE THIS BOX DISAPPEAR!

×

Pictures Posting Not Working (12 Jun 2023)

Picture uploads is again unavailable. We are working on the problem. Thanks for your patience.

Makotosun

1974 DT250 LED Headlight conversion.

  • Posts: 138
  • Likes received: 50

Replied by bart.ives on topic 1974 DT250 LED Headlight conversion.

Looks like you are on the right track. I went ahead and ordered the conversion housing and led bulb from Amazon. Looking forward to your success with this effort. To get high and low beams to work may have to add a rectifier and convert to DC. I have been contemplating this for a while. Good luck.
Be Happy!
The following user(s) Liked this Post: Yamalol
07 Oct 2019 04:23 #11

Please Log in or Create an account to join the conversation.

  • Posts: 1052
  • Likes received: 662

Replied by shyted on topic 1974 DT250 LED Headlight conversion.

Great subject,but it makes me laugh to know a push bike light is brighter than Yamahas effort.
The front light is shocking.
07 Oct 2019 12:30 #12

Please Log in or Create an account to join the conversation.

  • Posts: 138
  • Likes received: 50

Replied by bart.ives on topic 1974 DT250 LED Headlight conversion.

Found this video on how to wire Headlight from AC to DC with relay. I think this will work for this conversion to a DC LED headlight with both High and Low beams working. It is for a scooter but I think the addition of a relay to control battery power to the headlight would work. Relay AC to DC wiring
Be Happy!
Last edit: 07 Oct 2019 18:23 by bart.ives.
07 Oct 2019 18:21 #13

Please Log in or Create an account to join the conversation.

  • Posts: 4575
  • Likes received: 2207

Replied by Makotosun on topic 1974 DT250 LED Headlight conversion.

Unfortunately the relay setup presumes you have a 12 volt system. The relay may work fine on 6 volt, but you may need a 6 volt relay.

If it works, the setup should work. It doesn’t solve the issue of the overall low output, but the 6 volt LED bulb should.

Enjoying this discussion!
IF it isn't one thing, it's another.
08 Oct 2019 04:50 #14

Please Log in or Create an account to join the conversation.

  • MarkT
  • MarkT's Avatar
  • Away
  • Site Supporter
  • Site Supporter
  • Posts: 13387
  • Likes received: 9253

Replied by MarkT on topic 1974 DT250 LED Headlight conversion.

Just FYI, all he's doing is using a relay to connect the headlight to the battery and bypassing the original AC wiring to the headlight.

Relay is not turning AC into DC.

Relays are just basically a "remote control" heavy duty switch. On the old Yamahas, powering the headlight switch from the brown wire will accomplish the same thing.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
08 Oct 2019 06:09 #15

Please Log in or Create an account to join the conversation.

  • Posts: 138
  • Likes received: 50

Replied by bart.ives on topic 1974 DT250 LED Headlight conversion.

I think powering the Headlight Switch directly from the brown wire will have the Headlight and all lamps on all the time, in both the first and second on switch positions. Maybe not a desirable result. Using a relay triggered by the Blue wire and powered by the Brown wire to the switch would, I believe, leave the switch functioning as originally designed, first on position no lights, second on position lights.
Be Happy!
08 Oct 2019 07:03 #16

Please Log in or Create an account to join the conversation.

  • MarkT
  • MarkT's Avatar
  • Away
  • Site Supporter
  • Site Supporter
  • Posts: 13387
  • Likes received: 9253

Replied by MarkT on topic 1974 DT250 LED Headlight conversion.

1974 had the on off for the headlight in the handlebar switch.

Blue wire to taillight off the switch could be used instead of brown to power LED headlight off battery on a few years of the US bikes with headlight controlled by key...

Early US bikes and "other country" bikes had the taillight powered by the headlight AC circuit so blue wire on those would not work to power DC light or even to switch relay... (US law change in about 1970 required taillight to stay on with engine off)

Using a relay is generally not a bad idea... if using a low current LED the Yamaha switches are more than capable of handling the current without the complication of a relay.

Mostly i wanted to make it clear that the relay is not "converting" AC to DC. Question is if the battery charge circuit will keep the battery charged with an LED running off the battery full time. Would have to try it and see.

:Buds
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
08 Oct 2019 09:46 #17

Please Log in or Create an account to join the conversation.

  • MarkT
  • MarkT's Avatar
  • Away
  • Site Supporter
  • Site Supporter
  • Posts: 13387
  • Likes received: 9253

Replied by MarkT on topic 1974 DT250 LED Headlight conversion.

P.S. Nobody here said the relay was converting AC to DC... it was the video where the guy seemed to me to say that's what he was doing.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
08 Oct 2019 09:51 #18

Please Log in or Create an account to join the conversation.

  • Posts: 138
  • Likes received: 50

Replied by bart.ives on topic 1974 DT250 LED Headlight conversion.

MarkT, yes I understand your position, thanks for the clarifications. I have a 1968 DT1-250 that uses the switch to control the lights, so not that familiar with the differences between the 68 and 74 models. When I got mine it had no lights working, several later model parts, an earlier headlight lens assembly and a wiring harness that was fractured beyond repair. Lot of other issues also. I have a H4 6volt 35w/35w bulb but still not adequate light for my old eyes. That is why I would like to get an LED bulb if it provides better lighting. Any how here is my modified wiring diagram as of now for those who might be interested.
Be Happy!
The following user(s) Liked this Post: MarkT
08 Oct 2019 12:26 #19

This message has an attachment image.
Please log in or register to see it.

Please Log in or Create an account to join the conversation.

  • MarkT
  • MarkT's Avatar
  • Away
  • Site Supporter
  • Site Supporter
  • Posts: 13387
  • Likes received: 9253

Replied by MarkT on topic 1974 DT250 LED Headlight conversion.


bart.ives... yes, that is the early system and the problem with a relay triggered by the blue wire is that blue everywhere on that system is "AC" and the relay will need "DC" to reliably activate it.

Slightly later models had a different key switch where only the taillight (and not instrument lights) is powered from the battery with the key in "lights on" position. The later key switch/harness would reliably run a relay off the taillight wire.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
08 Oct 2019 12:52 #20

Please Log in or Create an account to join the conversation.

Moderators: yamadminMakotosunDEETVinnieJames Hart