Triumphrat

Nigle

I have a 2003 Trophy 1200 that suddenly quit running. I suspected the coils and purchased 2 new Nology replacements. The old coils were wired as follows (I think):
Left Side: green/brown = negative, yellow/white = positive
Right Side: blue/white = negative, green/brown = positive

Something tells me that is wrong. I have a Haynes manual but it only shows the wiring diagram for a 96 and later 900 with 3 single post coils. However in that diagram the green/brown is the common negative for all 3 coils. I suspect this is true for the 1200 as well with the green/brown going to the negative on both sides but I'd like confirmation before I blow something up.

KitNYC

I can verify for you that the green/brown is common ground for the triples according to both Haynes and FSM, but I don't see a wiring diagram for the fours in either book.

Maybe somebody better at electrickery can verify this, but I would think the negative wires would always have continuity to ground, and the positive would not? And if the wire itself is common, the green/brown connectors would have continuity with each other.

Cheers,
-Kit

BoardBandit

I confirm what Kit says about the wires....however, I don't think new coils are going to solve your problem. Bad coils usually do not cause the bike to "suddenly" stop running. Now a pickup coil maybe....

Good luck and let u know how it turns out.

PaulF

or vacuum issues ...

__________________
"Even if you are on the right track,
you'll get run over if you just sit there."
-- Will Rogers

IrlMike

Green/brown should be connected to the +tive terminal on both coils, the other wires go to the Igniter which switches on the ground side.

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98 Tbird tank/seat, Sprint fairing, ZX7R forks+Racetech Gold Valves, 08 ZX6R shock, Alcon 6-pot, Ignitech+TPS, T'bike 3-1+Beowolf can, airbox mods/rejet, tubeless wheels, lots :) per mile.

Nigle

Let me clarify. The bike didn't suddenly stop running, it suddenly stopped running properly. I could get it started if I held it at about half throttle but it ran rough and soon as I let off the throttle it stalled. It appears to be a problem with either the #3 or #4 cylinder but that is just a guess. There is connectivity between the 2 green/brown wires so I'm sure they are the ground wires but connecting the common wire to the positive terminals on the coils seems inconsistant with what I'm seeing in the Trophy 900 wiring diagrams.

Sixties Lad

There's a couple of shots of the coil wiring in this sequence that might help. TROPHY SERVICE Pictures 15 and 16 in the set.

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IAN - Sixties Lad

BoardBandit

I dunno.....sounding more like a fuel issue to me than coils.

IrlMike

Eh? The Green/Brown wires go to the engine kill switch in my wiring diagram & from there ultimately to battery +. (Service manual page 16.13 & Haynes the same.)

However, it appears these dual output coils use a single HT winding, one side to each of two plugs. So whichever coil primary polarity you use, one of the plugs is getting 'correct' polarity, the other the opposite. (The only difference being on which electrode the spark erosion occurs, centre or side. Generally, being 'meatier', the normal polarity erodes the side electrode rather than the centre.)

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98 Tbird tank/seat, Sprint fairing, ZX7R forks+Racetech Gold Valves, 08 ZX6R shock, Alcon 6-pot, Ignitech+TPS, T'bike 3-1+Beowolf can, airbox mods/rejet, tubeless wheels, lots :) per mile.

Nigle

Whoever said it wasn't the coils was correct. I replaced both and it still won't start. I verified I have good spark. What's the next step, rebuilding the carbs? My local dealer tells me that's about a $400 job.