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Trophy Trophy 3 & 4 - for all 900 and 1200cc models 1991- 2004

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Old 07-17-2012, 05:42 PM   #1 (permalink)
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voltage regulator ??

Ok guys here is my problem.... i have a 1999 trophy 900 vin #58483. At idle all my lights dim then get brighter as the revs build. I have been told its the voltage regulator. What do you guys think ?? If it is the regulator is it in the alternator or separate ?? Haven't put a meter on anything yet...that's next .Any input would be greatly appreciated !!! Thanks, David
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Old 07-17-2012, 11:20 PM   #2 (permalink)
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Welcome aboard!
How old is the battery?
I see you are Chattanooga. You should go to the Dragon Raid. http://www.thedragonraid.com/
Mark
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Old 07-18-2012, 12:49 AM   #3 (permalink)
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The regulator is part of the alternator on these bikes.

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Old 07-18-2012, 05:54 AM   #4 (permalink)
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I've had a Trophy here recently with a faulty voltage regulator. The voltage across the battery would reach about 16.5 volts at 2k or 3k rpm. Clearly not regulating - just giving full output, depending only on how fast it was spinning. This will reduce battery life & if a 'wet' type it will quickly lose fluid (water) leading to plate damage (so check battery fluid level, if wet type). You need to test the battery voltage whilst revving the engine. The normal maximum is about 14.5 volts & if all is working well it will approach this with some engine revving a minute or so after starting, depending on the initial state of charge & how much effort needed to start the engine.

The regulator can be replaced without alternator removal - 3 x 8mm nuts hold the end cap in place. An aftermarket regulator (physically quite different, but functionally the same) is available around $80 ish. But sometimes an alternator can be bought for less & the regulator swapped over. Some Kawas used the same Nippondenso unit too. I found one from a ZZR1100 for $40.

N5XL's excellent info on the alternator is here:

http://www.triumphrat.net/t3-sport-t...lternator.html

I'll mention another fault I found on a 97 Sprint (similar electrically to a Trophy) which may be relevant. The symptoms were flickering side/pilot lights, esp at idle, & occasional cutting out when headlights were switched on (UK bike with r/handlebar headlight switch). Voltage at the battery was a little low (under 14V) but enough to suggest the alternator was working. I suspected a poor connection somewhere.

The cause was a corroded contact & some fuse body melting at the main 30 Amp fuse in the fusebox. Sorted that & fitted a new fuse & all was well.
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Last edited by IrlMike; 07-18-2012 at 06:02 AM.
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Old 07-18-2012, 03:49 PM   #5 (permalink)
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Thanks everyone.... you guys are genuises !! Excellent article. Battery good.... alternator good.... now to find a regulator Thanks again, David
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Old 07-20-2012, 04:31 PM   #6 (permalink)
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I had the same problem with a Trophy a while ago, the problem that you are having is the preliminary issue, after a while it will just jkeep shorting out the main 30A fuse to the whole bike.

The reg is in the top of the altenator case, you only need to unbolt the 3 nuts from the top of the case and remove the top, the reg is then in the top facing you.

You will struggle to get an original one unless it is from a dealer at a stupid cost!

Best bet is to speak to "electrex world" who do aftermarket regulators at a fraction of the cost!

The new reg will come with instructions on how to fit it.

I ordered mine and it was with me the next day!

Happy fixing!
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Old 08-05-2012, 07:12 PM   #7 (permalink)
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Trophy, can you give any more details? I've got a '95 Daytona that keeps shorting the main fuse at what seems like random intervals. How did you diagnose it as the regulator? Where did you get a replacement?

I'm debating right now whether this is a regulator issue, or related to my Ballistic Performance battery. Any advice would help.

Domino, have you fixed the problem yet? What was your solution?

Thanks,
Sean
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Old 08-06-2012, 02:48 AM   #8 (permalink)
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Hi Sean,

I would say that from what you are saying I am 99.9%certain that it is the regulator. Mine was diagnosed on this forum by someone else, also if you just replace the fuse and keep using it at some point it will just blow the fuse as soon as you turn the ignition on.

What you need is an aftermarket regulator from electrex world's website. This will come with instructions as to how to fit it. In the Haynes manual it does have some tests that you can do to check the Old one.

The reg from electex world used to be the rg25 however looking at their website it looks lik they have bought out a ne range and it is now the rg26. If you are unsure iwould call them to make sure it will fit, their customer service skills are fantastic!

Hope this helps

Keith
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Old 08-06-2012, 09:25 PM   #9 (permalink)
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Sorry for the delay...12.3 volts on the battery....15.4V at 4000 rpm....installed the Racetech IC regulator (the one for a FJ)... now 14.2 @ 4000 rpm...but my lights are still dimming... hope this doesnt turn into an electric nightmare !! BTW Mark..i plan on going to the dragon raid for the day on saturday...its a hour and a half from me....gotta go...especially if i can see more trophys !!!!
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Old 08-06-2012, 09:34 PM   #10 (permalink)
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http://racetechelectric.com/c-326795...egulators.html
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