Dt 400 1975 indicator problems
In no particular order:-
1) Do you have a flasher/indicator relay? It should be located under the tank, underneath the top frame bar, just before the very front of the frame. There should be a brown, a brown and white and a black wire coming out of the main wire harness to plug into it.
2) As you sit on the bike, indicators for left side are dark brown and for right are dark green. It is the wire, very often coloured black, coming out of the centre of the indicator that plugs into these colours on the main harness. For the rear indicators, if the rubber mounts are present, then you will need an additional wire sitting via a ring connector on the indicator stem, underneath the washers and nut - this is the earth wire. The other end plugs into the black on the main harness.
There should be, I think, a three or four socket black female connector coming out of the main harness under the seat, roughly on top of the rear mudguard - plug the black from the tail light and the wire from each side that I have just mentioned into this.
If you have bolted the indicators to the frame without the rubber mounts in place, then you probably won't need to do this, as the indicators will earth directly against the frame.
3) At the front, the indicators should earth directly from the handlebars, assuming that they aren't heavily painted.
As above for the wire coming out of the centre of the indicator being treated as dark brown or dark green. They feed into the hole in the back of the headlight shell and connect with three female socket dark brown and dark green connectors in the headlight shell. The other two sockets of each are occupied by the same coloured wires from the indicator switch on the handlebars and the flasher warning light in the tacho.
Don't mix up the dark brown wires with the lighter brown, or the dark green with the blacks - this is easily done with old, dirty and/or faded wires.
They run off the battery, so this must be present for them to work.
Vincent Hunt wrote: I really wish you were local to me ahha. Cheers for the response. I will maybe try and attach photos if possible. I dont suppose you have WhatsApp? Cheers again!
No Whatsapp or Arsebook etc - I'm a bit of a Luddite concerning that sort of thing! Forums and fleabay is as far as I go.
Treat the wiring more as a puzzle than electrics. Bar the wires coming out of the centre of the indicators previously referred to, every other wire should be colour coded and should only be connected with a wire of the same colour.
Yes, photos would be great if your stuck on something. In fact, photos of members' bikes are great anyway!
I suspect you've got a dodgy connection somewhere for the warning light to come on with ignition. Go round each wire and give a little wiggle to see if it makes a difference. On my RD125 it was a bad connection to one of my indicator bulbs.
Good progress though, well done!
Edit - Is it the original relay or a later replacement?
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Vincent Hunt wrote: Hi again mate, I've got the indicators working although they're pretty dull. They dont flash and the relay makes a dodgy noise when I turn the switch left to right. I've ordered a new relay for 13quid so hopefully I can sort it very shortly. Cheers for the help!
13 quid - so you'll be in the UK then? I'm between Salisbury and Shaftesbury.
One of many things I learned from MarkT was how to wire a new, modern relay - be aware that modern three pin relays are not the same as original Yamaha ones. You only really need a two pin one and the brown wire goes to the pin marked B or X and the Brown/White to the pin marked L. You should ignore the other one and leave the spare black wire from the main loom vacant.