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1981 DT175H Wiring Question

09 Jun 2019 18:24
MarkT
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1981 DT175H Wiring Question #21
It can depend on year, model, and even what country the bike was first sold.

Also, there are two filaments in the rear bulb. One "dim" one for the taillight and one "brighter" one for the brake light.

On the US 1980-81 DT175 the taillight comes on when the key is turned on. Brake light comes on when brake is applied (key has to be on). Headlight comes on when engine is running.

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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13 Jun 2019 06:32
JordanCook
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1981 DT175H Wiring Question #22
I have a US/Canada '80
I feel it went through some kind of bad electrical event.... but can't figure out what it was. Maybe someone at some point tried boosting it with a 12v system unknowingly!
Rectifier was blown, all the cluster lights blown, headlight...
All the wiring I have looked at seems good. Nothing melted
But the brake light stays illuminated like the brake switch is activated, and blinks with the the indicators when they are selected....
Think it could be a bad ground?

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13 Jun 2019 18:54 13 Jun 2019 20:21 by MarkT.
MarkT
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1981 DT175H Wiring Question #23
Rectifiers go bad sometimes. 12 volt won't do it. Reversed battery connections often does. Headlight does not run through rectifier nor do the gauge illumination lights.

Headlight and gauge illumination bulbs blow really fast on the later models with regulators if regulator is not connected/working. So where I would start is making sure your regulator is connected and the ground wire is attached to the case. Regulator is a small box bolted to the plastic air/battery box. Has a single yellow wire coming out of it. Case has a black ground wire to one of the mounting bolts (needed because it's bolted to plastic)

On the taillight on "bright" most likely is the front or rear brake switch is stuck "on". Second most likely is the bulb has been forced into the socket 180 degrees out or the tail filament in the bulb broke and is touching the brake filament.

Good luck... it's probably simple stuff. :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

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24 Aug 2019 12:51
JordanCook
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1981 DT175H Wiring Question #24
Hey there!!
Sorry for the delay in response.
So upon further investigation, it turns out that it is completely operator oversight in recognizing the problem.
A DUAL filament bulb certainly helps in rectifying why the light would not have 2 different brightnesses.
When i originally purchased the replacement bulb, i did not look at what it was, just asked for a replacement.
Thank you for your Guidance MarkT
Yay2

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24 Aug 2019 12:59
JordanCook
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1981 DT175H Wiring Question #25
This is My first "old" bike LOL

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24 Aug 2019 14:04
MarkT
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1981 DT175H Wiring Question #26
Very nice! One of the most fun and best bikes around! :likey

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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