Send it back and get a proper one from a Suzuki dealer.
Did the owner tell you why the wiring loom is all messed up? It is often the indication of a stolen bike.
You need the Service Manual
https://motoservicemanual.com/suzuki-gs650-1981-1983-service-manual/
This one says FREE
https://www.carlsalter.com/download.asp?p=2492
WIRING DIAGRAMS
https://www.google.com/search?q=gs650+katana+1983+wiring+diagram
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A harness is kind of hard to mess up unless purposely major accident or fire --Did you get a correct harness does sound like it and since your limited info no going to be able to assist get a repair manual or request assistance from a mechanic or dealer or even let one of them do the repair
SOURCE: vrvd630 wiring harness
Hallo! It very easy. I bought some parts (probably $5) and made adapter. Everything work perfect. Good luck! If you have some question please write on email: [email protected]
SOURCE: Battery would not charge while bike is running.
u sure the alternator is producing-hows the wire connections to batery-inspec fuses n other partz of harness
SOURCE: aftermarket stereo wiring harness does not fit oem
Theres a standard amongst most stereos, so if these colors apply, then you will be right,
Red is Ignition power
orange is direct power
Black is earth
blue is for phone
White is for electric arial
then there will be four coloured wires with matching color trace wires, these are the speaker wires.
Hope this gets you going, good luck.
SOURCE: 1993 deville 4.9 missing
CHANGE FUEL FILTER AND CLEAN FUEL INJECTORS,CLOGGED FUEL INJECTORS WILL CAUSE ENGINE TO MISS, MAKE SURE SPARK PLUG GAP IS 0.060, LEAN MISFIRE FROM WEAK FUEL PUMP,CHECK FUEL PRESSURE SHOULD BE 40 - 50 PSI. IF EVEVY THING CHECK OUT OKAY,MISSING PROBLEM COULD BE LOW CYLINDER COMPRESSION OR INTAKE MANIFOLD AIR LEAKS.DO A COMPRESSION TEST IF NECESSARY.
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