Quote:
Originally Posted by
gaulty
my 1.600 mile year 13 tenere 660z .cut out yesterday.it had blown a 10amp ingnition fuse..i replaced it but it blew immediately..the lights all come on and it cranks over fine but wont start...replaced the fuse again this time it ran ,switched on and off 3 more time running ok..then it blew again ...it either runs for a few seconds before blowing the fuse or it blows the fuse immediately...i have checked the battery connections and had a general look around the electrics...the relay was making a click noise before starting when it did start,but i assumed this was normal.
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There are quite a number of components take a feed off ignition fuse 4: starter relay (trigger), ECU, start inhibit relay (trigger), engine stop switch, instruments, immobiliser and cooling fan relay (trigger). The ECU, instruments and cooling fan relay are highly unlikely to be the issue, but it could be any of the causing the issue. However�
From what you describe, and the fact that everything works except the starting (and that it�s intermittent) would suggest it could well be the starter relay. This relay is not diode protected so any internal problems, such as quickly collapsing field coil voltage when de-energised, will cause a temporary spike (a �fly back� diode would provide a safe slow leak for the excess current). Fly back current like this can cause arcing and damage to the relay, reverse currents and blow fuses. The arcing can then cause a �sticky� relay contact, which might explain why it works sometimes and not others and is making louder than normal clicking noises?
Best thing to do would be to try and get a known good substitute starter relay and swap with the suspect one and see if the problem goes away. A new relay is about �50, so you�d want to make double sure before condemning the existing one.