Grand Prix 250
Main Motorcycle: Bonneville T100 EFI 2007
Join Date: Mar 2017
|Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, Bobber, T100, Speedmaster, America, Thruxton, and Scrambler.
Sponsored by: Triumph Twin Power Ltd
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OK...firstly, lets jump to the solution that worked for another user after several days of troubleshooting....his Kill switch was in the off position!
He never used the kill switch ever...someone else had handled the bike while transporting it and knocked it to Kill....he completely overlooked it in his troubleshooting and it had the exact same symptoms you are now reporting...no horn, lights on etc.
OK, check you are not in gear with the sidestand down (there is an interlock to prevent starter if this is true). Check your fuses to see if there is a blown one (like the 30 AMP starter one).
Having no fuel should not prevent it from cranking.
These bikes have an ECU voltage cutoff point that is just a little below the 12v level...a small drop in battery volts will prevent it cranking. Can be bypassed by closing the starter relay manually (there are threads on the forum showing how to modify the relay to fit a simple dowel through its casing that you press for emergency starts. Note this will bypass all the safety interlocks like sidestand down, clutch in, neutral etc...be careful using it.
Try giving the battery a boost or trickle charge. You say you are not sure of proper boost method? Just hook up positive cable to positive (red) boost battery terminal, negative (blck) to negative.
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