Anyone good with wiring?

Hi, recently swapped the standard clocks on my 2001 naked curvy for an Acewell unit. Got most of it wired up, clocks work fine but the bike won't start. There's a black and yellow wire labelled Ignition (Signal) that sit's in the original clock wiring loom that's not connected at the clock end, the other goes to the negative terminal of the front ignition coil. If you brush it against a positive connection briefly it sort of sparks up but not really.

Can't see why such a wire would need to go to the old clocks?

Could do with knowing where it's supposed to go, any help greatly appreciated!!!

talk to baph he's a dab hand with the old wires.

The black/yellow wire from the clocks is the negative feed from the front coil, and the ignitor.

This probably explains why the bike isn't firing properly. Unfortunately the clocks are a bit of a mystical beast with regards their internals, but the black/yellow wire should DEFINATELY be connected up, otherwise your front clyinder won't run.

The wire should be connected in harness 2, which IIRC, is down behind the headstock (in front of the air box). From here, it should run to the coil & the ignitor afterwards.

Don't connect it to a positive feed, please, at best you'll run the clyinder backwards. It's a ground wire.

just isolate wire and you be fine.it is coming from coil and is tachometer wire.
not reason for not running.nothing in clocks to stop bike from running.

Originally Posted by Baph

but the black/yellow wire should DEFINATELY be connected up, otherwise your front clyinder won't run.

that is not correct.cylinder will still run since wire is connected to coil.
wire originally comes from ECU and splits in 2,one end goes to coil and other to tach.this is where tach reads pulse and shows rpm's.
it does not go to clock and than back to coil.

Originally Posted by zadar

just isolate wire and you be fine.it is coming from coil and is tachometer wire.
not reason for not running.nothing in clocks to stop bike from running.

Funny, as the OP says the bike isn't running.

The rear coil negative joins directly to the ignitor. There is a reason that the ground is connected from the clocks to the front coil, then to the ignitor. If there wasn't a reason for it, I'm sure that Suzuki wouldn't of bothered putting it there. As the OP states, it's labelled "signal" and used to detect when the front plug is firing.

On the pointy, without this wire connected at the clocks, you get an FI warning for no spark at the front plug (C32 IIRC). Also (again, pointy specific), if you don't have more than 7.5 volts coming into the clocks, you have no ignition. So the clocks have a pretty major role in the running of the bike IMO.

Regardless of if this is just a sensor wire for the rev counter, I'm guessing the OP wants an operating rev counter... and it's one less thing to look at with regard the bike not running.

reason been it is signal for rpm's.and it is not ground.it is signal coming from pulse generator that tells CDI box where piston is by trigger on flywheel.than CDI sends signal to coil to fire.reason for brief spark.
pointy and curvy S model is different storry.
you can unplug gauges from naked and bike will run.OP has problem somewhere else with wires,not that one.

Originally Posted by Baph

Regardless of if this is just a sensor wire for the rev counter, I'm guessing the OP wants an operating rev counter

in which case this wire gives pulse.he still needs power and ground for tach to work.
since I deal with US models I looked in wire diagram.both US and UK models have same clocks and wires associated with it.

[quote=Baph;1596688]
The rear coil negative joins directly to the ignitor. There is a reason that the ground is connected from the clocks to the front coil, then to the ignitor. If there wasn't a reason for it, I'm sure that Suzuki wouldn't of bothered putting it there. /quote]
you are correct on rear.wire goes direct to coil and stops there.
now imagine wire going direct to front(as it does)and than you splice same color wire on it and go to clocks.it is just extension that ends on tach.with or without it you will have connection on coil.

Originally Posted by zadar

now imagine wire going direct to front(as it does)and than you splice same color wire on it and go to clocks.it is just extension that ends on tach.with or without it you will have connection on coil.

No need to imagine, I know what you're saying.

As I previously posted, on a pointy without this wire connected, you get an FI fault for no spark at the front plug (which is somewhere in the region of low 30s, and IIRC, is C32 - maybe C33).

I guess in theory you'd have a bike running on the rear cylinder alone, but mine has always been a beggar to start on the rear alone (tried it a few times due to wet front plug syndrome).

Again, as originally posted, the B/Y wire is a ground wire (even if it only grounds from the coil to the ignitor), and as such, positive current shouldn't be applied to it.

IMO, all wires should be connected before someone starts electrical troubleshooting (finding a dodgy earth is bad enough as it is, for example).