facebook1 youtube1 twitter1 instagram google plus linkedin1 pinterest1

logosmallNOTICE:  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!

Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1

TOPIC: RS100 lighting troubles

RS100 lighting troubles 26 Jun 2019 18:19 #1

  • meadeam
  • meadeam's Avatar Topic Author
  • Offline
  • Site Contributor
  • Site Contributor
  • Posts: 165
  • Likes received: 130
Posting here because I am guessing the RS100 has enough in common with the 100-175cc enduros of the same era.

I’ll start by saying this is my first time dealing with electrical issues on a bike. Past bikes I’ve owned miraculously never needed anything more than a bulb change.

Headlight: high and low beams work. Yeah!
Tail light: works
Brake light: tail light cuts out when brake is applied, brake light does not come on.
Signals: no blinks, but come on solid on the correct side.

All of the lights are quite dim, which I suppose is expected. They brighten considerably with engine revs from near invisibility at idle. Bike starts and runs great. I rode it around the neighborhood this afternoon to see if there was any improvement, after running awhile. No changes. I didn’t want to ride too much as I don’t have a plate on it yet

I own a multimeter and am not afraid to use it, but am a novice. I’ll scour the web for info, but if Anyone has a standard procedure they use to solve lighting issues, let me know. This will be a good warm up befor tackling the dt360 wiring and new power dynamo.

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

1974 DT360
1975 RS100
2007 FZ6
Fort Thomas, KY

RS100 lighting troubles 26 Jun 2019 19:58 #2

  • Mothersbaugh
  • Mothersbaugh's Avatar
  • Offline
  • Collector
  • Collector
  • Posts: 1262
  • Likes received: 622
I'm pretty worthless with electricity thus far, but the tail light sounds like you just need a new bulb. The taillight should go out when the brake light takes over, but the brake light filament is burned out. 1157 is the 12 volt version; you probably need the 6 volt version?

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

RS100 lighting troubles 26 Jun 2019 20:26 #3

  • MarkT
  • MarkT's Avatar
  • Offline
  • Site Contributor
  • Site Contributor
  • Posts: 5567
  • Likes received: 2855
Sounds like a bad battery or bad ground/connection to me.

Start with your voltmeter at the battery. Should be a little over 6 volts with everything off and battery charged. Activate brake light and/or turn signal. What happens to the voltage at the battery? I suspect you'll see a significant drop?

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

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

RS100 lighting troubles 27 Jun 2019 17:26 #4

  • meadeam
  • meadeam's Avatar Topic Author
  • Offline
  • Site Contributor
  • Site Contributor
  • Posts: 165
  • Likes received: 130
Only 3.2v at the battery. Water was way low too. I filled it up and will charge it. I thought the seller said it had a new battery but I might have imagined that.

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

1974 DT360
1975 RS100
2007 FZ6
Fort Thomas, KY

RS100 lighting troubles 27 Jun 2019 17:33 #5

  • MarkT
  • MarkT's Avatar
  • Offline
  • Site Contributor
  • Site Contributor
  • Posts: 5567
  • Likes received: 2855
Hopefully a top off with water and a charge will fix your issues. Fingers crossed!

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

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

RS100 lighting troubles 27 Jun 2019 21:15 #6

  • Mothersbaugh
  • Mothersbaugh's Avatar
  • Offline
  • Collector
  • Collector
  • Posts: 1262
  • Likes received: 622
Try the epsom salts trick.

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

RS100 lighting troubles 28 Jun 2019 07:10 #7

  • meadeam
  • meadeam's Avatar Topic Author
  • Offline
  • Site Contributor
  • Site Contributor
  • Posts: 165
  • Likes received: 130

Mothersbaugh wrote: Try the epsom salts trick.


I don't know that trick. I will ask the google machine.

After a trickle charge, the little battery is at a thriving 7.2v. I didn't have time to try out before work this morning, but hopefully I have fully functional lighting now, and the battery will remain charged with use.

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

1974 DT360
1975 RS100
2007 FZ6
Fort Thomas, KY
  • Page:
  • 1
Moderators: VinnieDEETyamadminDmanEnduronutMakotosunDevinJames Hart