In light of the low voltage cutoff from the ECU, one could possibly get caught in a no-start situation due to a 0.1 v voltage difference at the battery. So, for example, if the battery voltage is 0.1 volt than the threshold, the starter interlock would prevent the bike from starting. There is a simple modification that you could make to bypass that interlock, and start the bike.
I'll start off with great thanks to Ken D'Ecosse of (www.triumphrat.net) that devised a way to install a
bypass switch between the starter solenoid and starter relay. Ken has graciously allowed me to reproduce his
findings here on BA.com.
The America and Speedmaster models have the starter relay located under the fuel tank on the left hand side of the frame backbone. This relay is also known as the Headlight Relay or Headlight Dip-Switch Relay. This relay doubles as a headlight cut-out and starter relay. It cuts out power to the headlight when the starter is operating. There is also a way to install a manual intercept button directly on the relay, but since the relay is not accessible, a bypass switch is a more viable solution.
This Emergency Start Mod would work if your battery may be strong enough to prime the fuel system, but be below 12.6 volts.
NOTE: that by using this mod, all safety controls are also bypassed . So. kickstand switch, clutch switch, neutral switch, etc are bypassed, so make sure the bike is in neutral first! From Ken:
The other way to go would be to connect a 'bypass' switch between the two white/red wires - if you close that
switch the starter power will transfer directly from the start button to the solenoid, again bypassing all the interlocks. In a pinch, if stranded, (even without having a switch installed), you can pull the relay out of the socket & just stick a paper clip across those two contacts. Once started you can remove the shorting link (paper clip)
& replace the relay in the socket to get the headlight back again. Neither of these methods is drawing any serious current through the starter button, just the starter solenoid current (not substantially different from the relay), And generally operation is essentially the same with the starter button controlling the start function.
And by this method you avoid shorting the ECM output to ground - although a well-designed short-protected
output device, just as well not to tempt fate & test that repeatedly!
By Hyates
forum thread
