fuelpump on 83

[Neil86]

Rodney...

as I mentioned before...I don't think the 83 relay is controlled by firing like the later ones.

The later ones use the gray wire from #2 coil for tach and fuel pump relay.

 

 

Normally the voltage on the black/white on the TCI (stock) is very low

like 1.2-1.4 volts or so...don't know whats normal on Ignitech.

With the black/white unhooked from Ignitech..and engine running...is there voltage showing in the b/w wire down to the tipver and sidestand relays?

 

If there is...I would say there is a failed diode allowing current to flow through the fuel pump relay coil back into TCI.

[rbig1]

well what is this one with blue connector the one that says oem side stand. so now there is tf307 relay not in 83 wiring diagram may be wrong diagram in tec section don't think there is a gear indicator in 83:doh:

[Neil86]

Rodney...

 

all I'm saying is in my 83 service manual they show one blue/white wire from pump relay coil going to tipover switch, a black/white from interlock system with a diode going to tipover switch too.

Without the diode you could feed power from the pump relay back into TCI or into sidestand relay. Your diode may have failed causing the fuel pump relay to open randomly.

In newer bikes (84-up) they redid the wiring so the tipover switch kills ignition, then #2 coil ground (gray) no longer cycles and the fuel pump relay opens killing pump.