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RS100 lighting troubles

26 Jun 2019 18:19
meadeam
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RS100 lighting troubles #1
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.

1974 DT360
1975 RS100
2007 FZ6
Fort Thomas, KY

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26 Jun 2019 19:58
Mothersbaugh
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RS100 lighting troubles #2
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?

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26 Jun 2019 20:26
MarkT
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RS100 lighting troubles #3
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?

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

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27 Jun 2019 17:26
meadeam
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RS100 lighting troubles #4
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.

1974 DT360
1975 RS100
2007 FZ6
Fort Thomas, KY

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27 Jun 2019 17:33
MarkT
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RS100 lighting troubles #5
Hopefully a top off with water and a charge will fix your issues. Fingers crossed!

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

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27 Jun 2019 21:15
Mothersbaugh
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RS100 lighting troubles #6
Try the epsom salts trick.

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28 Jun 2019 07:10
meadeam
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RS100 lighting troubles #7

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.

1974 DT360
1975 RS100
2007 FZ6
Fort Thomas, KY

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