12425 - Established June, 2013 - all GRiSO, all the time...
 
HomeFAQRegisterLog in
Share | 
 

 Alternator output went up???

Go down 
AuthorMessage
GHTE
Tiradritto
Tiradritto
avatar

Posts : 380
Join date : 2015-02-09
Age : 65

PostSubject: Alternator output went up???   Sun Feb 04, 2018 12:52 pm

Cruising without stress the bike was putting circa 13.6 volts out. Push it over 120kms and the read out would drop to 13.4.
Yesterday we had a naughty thrash up falls creek. I noticed on the return down bill ride the alternator was showing 13.9/13.8 and on the flat home it settled at 13.7/13.8. Is it the last hurrah before the alternator craps out or is it perhaps the regulator dicky-any ideas. Otherwise she runs a treat.
Back to top Go down
https://glennhilleard@gmail.com
Oz1200Guzzi
Don Abbondio
Don Abbondio
avatar

Posts : 2978
Join date : 2014-03-13
Age : 63

PostSubject: Re: Alternator output went up???   Sun Feb 04, 2018 1:38 pm

What's on the dash is a result of the elektrikery used by Guzzi. On my bike, I add 0.8 V to the dash reading and yes it goes up and down somewhat. On a good day, I will see 13.0 V on the dash, when first started, 12.2 V is normal.

I find the best time to read the dash readout is around 2,000 RPM. Over this, there are some electrical harmonics happening, and the readout being LCD, is fairly slow and cannot read an instantaneous number successfully.

These harmonics come from the ignition coils as they make and break, and fire off the HT to the plugs, so the system has a ripple on the nominal 12 V rail. I think also the regulator charges up the battery and then backs it all off a tad, when deemed to be charged.

I use a LiFePO4 battery, too, which has a higher requirement for a full charging level - ideally 14.2 V.

I am about to replace the large wire coming from the alternator to improve this situation (we all know MG put the smallest wire possible into these bikes, that's why many of us suffer startus interruptus) with a larger CSA to assist in getting better numbers for the battery (on the dash too).
Back to top Go down
beetle
GRiSO
GRiSO
avatar

Posts : 5723
Join date : 2013-09-30

PostSubject: Re: Alternator output went up???   Sun Feb 04, 2018 1:53 pm

What Tony said. The dash is as slow as a wet week in it's calcumulations. Accuracy of the voltmeter is questionable, wiring is less than stellar, harmonics, quantum static, et al, can all cause inaccuracies in the displayed voltage.

Attach multimeter to battery. Observe volts at various revolutions. Ponder.






Last edited by beetle on Sun Feb 04, 2018 2:35 pm; edited 2 times in total
Back to top Go down
https://www.griso.org
sideshowbob
Biondino
Biondino
avatar

Posts : 296
Join date : 2017-08-06
Age : 63

PostSubject: Re: Alternator output went up???   Sun Feb 04, 2018 2:28 pm

Clean your carbohydrate!
Back to top Go down
ghezzi
Fra Cristoforo
Fra Cristoforo
avatar

Posts : 2517
Join date : 2014-05-22
Age : 61

PostSubject: Re: Alternator output went up???   Sun Feb 04, 2018 7:51 pm

Also you have to take what Tony says about electrickery with a grain of salt, or should that be a grain of ant. He has 3 5 permanently fried black ants IN his dash. I suspect they have been nuked by one of his ray guns.
Back to top Go down
http://www.biketowbrisbane.com.au
GHTE
Tiradritto
Tiradritto
avatar

Posts : 380
Join date : 2015-02-09
Age : 65

PostSubject: Re: Alternator output went up???   Sun Feb 04, 2018 9:11 pm

Ok guys thank you for a great timely response. So first I will check to see if there are any fried ants in the works then basically muck around with my multimeter.
I had an early multistada (air cooled ) and by putting a larger earthing strap on her made a significant starting improvement.
Back to top Go down
https://glennhilleard@gmail.com
beetle
GRiSO
GRiSO
avatar

Posts : 5723
Join date : 2013-09-30

PostSubject: Re: Alternator output went up???   Sun Feb 04, 2018 9:21 pm

GHTE wrote:

I had an early multistada (air cooled ) and by putting a larger earthing strap on her made a significant starting improvement.


Also applies to Guzzi's.




Back to top Go down
https://www.griso.org
ghezzi
Fra Cristoforo
Fra Cristoforo
avatar

Posts : 2517
Join date : 2014-05-22
Age : 61

PostSubject: Re: Alternator output went up???   Sun Feb 04, 2018 11:20 pm

Actually, one of the best mods you can do is re-attach the earth strap to one of the 8mm crankcase/gearbox mounting studs.

The original is held by a pissy 5mm screw, you'll find it above the starter motor, under the starter motor cover. Drill the eye out to fit the 8mm stud, located just above and to the left of the original location.
Back to top Go down
http://www.biketowbrisbane.com.au
GHTE
Tiradritto
Tiradritto
avatar

Posts : 380
Join date : 2015-02-09
Age : 65

PostSubject: Re: Alternator output went up???   Sun Feb 04, 2018 11:27 pm

Thank you Ghezzi, I am about to change fan belts so I will do both operations at the same time.
Good advise-cheers Mmate.
Back to top Go down
https://glennhilleard@gmail.com
Oz1200Guzzi
Don Abbondio
Don Abbondio
avatar

Posts : 2978
Join date : 2014-03-13
Age : 63

PostSubject: Re: Alternator output went up???   Mon Feb 05, 2018 12:45 am

I resemble those remarks. Might also be pissed - flaming ingrate kids...
Back to top Go down
avgpetro
Grignapoco
Grignapoco
avatar

Posts : 110
Join date : 2016-11-26
Age : 50

PostSubject: Re: Alternator output went up???   Mon Feb 05, 2018 11:05 am

Maybe the shake cracked some of the birt / oxidation from one or more contacts?
Back to top Go down
 
Alternator output went up???
Back to top 
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
GRiSO ghetto :: The Ghetto :: GRiSOLOGY-
Jump to: