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

TOPIC: 1981 DT175H Wiring Question

1981 DT175H Wiring Question 09 Jun 2019 18:24 #21

  • MarkT
  • MarkT's Avatar
  • Offline
  • Site Contributor
  • Site Contributor
  • Posts: 5520
  • Likes received: 2743
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.

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

1981 DT175H Wiring Question 13 Jun 2019 06:32 #22

  • JordanCook
  • JordanCook's Avatar
  • Offline
  • Newbie
  • Newbie
  • Posts: 3
  • Likes received: 2
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?

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

1981 DT175H Wiring Question 13 Jun 2019 18:54 #23

  • MarkT
  • MarkT's Avatar
  • Offline
  • Site Contributor
  • Site Contributor
  • Posts: 5520
  • Likes received: 2743
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

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
Last Edit: by MarkT.
Moderators: VinnieDEETyamadminDmanEnduronutMakotosunDevinJames Hart