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Offline pagandr

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Alternator output ?
« on: February 26, 2019, 10:01:50 PM »
Hi guys, could anyone let me know what the correct a/c voltage should be coming from the alternator please.
I'm possibly a bit out of my depth with electrics! :191:

Online Rtwo

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Re: Alternator output ?
« Reply #1 on: February 27, 2019, 06:32:32 AM »
There have been a couple of different alternators but the original >MY2015 is 15-25VAC @850rpm

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Offline tewe

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Re: Alternator output ?
« Reply #2 on: February 27, 2019, 06:33:17 AM »
snip from the service manual:

Alternator/Charging System
The charging system consists of an alternator and a
rectifier/ reg ulator assembly and the battery. The
alternator is made up of two parts, the stator, which is
mounted to the crankcase or the en gine cover, and the
rotor, mounted to the end of the cran kshaft. The stator is
an assembly of 18 co ils, arranged into 3 phases. The rotor
is a series of magnets mounted in the engine flywheel,
which are arranged so

as to be positioned around the
outside of the stator co ils. As the en gine rotates the
alternator produces an ac <alternating cu rrent) vo ltage in
each of the three phases of the alternator, typically of
around 35 to 40 volts ac at 4000-5000 rpm, although
this fi gure varies between models. As the battery requires
de (d irect current) vo ltage for correct charg ing, this ac
vo ltage must be first rectified to de cu rrent, and then
re gulated to the correct voltage for the battery of
14.50.5 volts. Th is is done by the rectifier/regulator,
---

tewe


Offline pagandr

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Re: Alternator output ?
« Reply #3 on: February 27, 2019, 07:37:50 AM »
Thanks for the replies.
My 2011 800 recently fried the battery so checked the regulator and found it to be faulty.
 Checked alternator - no continuity to ground, which is supposed to be a good sign,  but around 43ac volts across all 3 phases at tickover (have not yet taken it up to 4000rpm to check).
Any further thoughts/advice would be greatly appreciated.  :440:

Offline JMc

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Re: Alternator output ?
« Reply #4 on: February 27, 2019, 02:06:22 PM »
Less important is the ac voltage output from the alternator and more important it is balanced across the phases, ie. L1-L2 43Vac L2-L3 43Vac & L3-L1 43Vac, the actual output voltage as the above state can vary between models. Most important is having the correct Reg/Rec that is rated at the input voltage you have and the output DC voltage is 14.5V and no more.


Any imbalance on the alternator voltages would be a sign of a winding failure, its also possible the output voltage is higher as there is very little load on the alternator, the voltage will drop a bit under load from the electrics on the bike

Jmc

Offline Stevie.P

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Re: Alternator output ?
« Reply #5 on: February 27, 2019, 02:24:52 PM »
*Originally Posted by pagandr [+]
... so checked the regulator and found it to be faulty.

Are you assuming because the R/R went faulty you have an alternator fault? The R/R often just fails, no alternator issue. My 2015 XRt R/R failed 6 months after 2yr warranty finished, simply replaced and all good.
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Offline pagandr

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Re: Alternator output ?
« Reply #6 on: February 27, 2019, 02:50:11 PM »
Thanks JMc & StevieP,
Looks like I have cooked the replacement R/R, which was a cheap alternative, from squaredeals-ltd. I know - you get what you pay for! :138:
It didn't smell too good and when removed had a brown oily substance around the alternator connection.
Any recommendations on where to purchase a good one without paying Triumph prices?
Cheers All.

Offline RaglandT

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