Since you say that there is no speedo output on the gearbox I assume that its the mechanical speedo model. You should be able to find the mechanical speedo drive on the front wheel, unless you have only the engine, in which case, the America/Speedmaster engines are 270*, as is the Scrambler.i have no year unless i can trace it from the engine number ,i have no electrical equipment only the engine and loom ,does the mechanical speedo, drive from the wheel or gearbox if its gearbox then its electronic as theirs no output on the gearbox ,sorry but its all i have hope you guys can point me in the right direction.
pretty sure its this diagram ,but the quality is so poor its unworkable
I don't know where to start with this. There are so many factors here which could prevent the engine from ever running if you haven't got it right.give you an idea when asked about the speedo drive for example ???
If its a CANBUS harness you are using, the ECU will not function and the bike will not run without the OEM speedo.i wont be running a speedo/rev counter
That is the easy part, once you have determined what you are working with.problem i have is identifying the different systems as some numty as cut most of the plugs off .
really grateful for your time RipperCan you tell me, or are you 100% sure that the harness and engine you have are from the same bike? Also, what was the donor bike, an America?
I'm asking these questions because there are 2 types of engine and 2 types of EFI wiring harness, and there is no pick 'n mix.
Firstly the engine - the Scram, America and Speedmaster have 270* engines. This will affect the wiring in the sense that these models use two single fire ignition coils and the programming of the ECU is different. Bonnevile, T100, Thruxton have 360* engines that use a single ignition coil with dual leads and wasted spark.
It doesn't matter whch engine you have as long as you know what it is - you can't run a 270* engine on an ECU programmed for a 360*.
The wiring harness is a bit easier to determine. The two types are CANBUS and non CANBUS. The CANBUS harnesses are fitted to models with electronic speedo. You can find out which type you have by finding the OBD2 diagnostic connector, hopefully the idiot plug cutter has missed this one, since its the only way of tuning the bike. Look at the number and colours of the wires going to the connector:
CANBUS models, 7 wires.
Non CANBUS models, 3 wires.
If its a CANBUS harness you are using, the ECU will not function and the bike will not run without the OEM speedo.
That is the easy part, once you have determined what you are working with.
I'm using the diagrams from the Haynes workshop manual, which although there are a couple of misprints cover every model of modern classic twin to my knowledge. They show either 3 or 7 wire diagnostic ports. Good to know that its up and running though, you can start tearing wires out now.the plug has 5 wires going to it ,which i know does not correspond to your info ,the OBD plug has not been tampered with
i will look at the colours on the plug tomorrow and let you know.
been trying to source a wiring diagram but everything i look at on the net seem to be only partly the same as this loom
No, all EFI models according to Haynes are either 3 or 7 wire and that includes the cruiser twins. It doesn't really matter because the absence of the Red and Blue wires would indicate that the harness is from a non canbus bike. I don't know, but perhaps your particular harness is transitionary, either that or there are two wires missing from all of the non canbus EFI models in the Haynes manual.Ripper the wires to the obd2 are
same as thruxton/scrambler T100
minus the red wire????????????