V7 850 GT not charging |
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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Have you cleaned/brightened all the terminals/connectors? Battery terminals and battery earth to frame?
The next step would be to check the dynamos' none regulated output.If that is OK then I would think the regulator may be to blame.An auto electrician can test and if required adjust it for you.You would have to take it off the bike.You could also take the dynamo in for testing. Edited by Dave P. - 15 Feb 2019 at 17:41 |
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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el__burro
Senior Member Joined: 04 Aug 2018 Location: London UK Status: Offline Points: 423 |
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Yes, all terminals cleaned. How would i rate the Dynamo output? thanks el__burro
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Mind you 13.5V is not that bad. Are you sure that isn't what it's supposed to be? |
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"Chicken nuggets don't dance on a Tuesday."
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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According to the book Mike, 13.8V to 14.5V.
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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To test the dynamo do the following;
Disconnect all three leads from the dynamo. Connect the D+ and F terminals together with another piece of wire. Connect the positive lead of your voltmeter to D+ and the negative lead to a good earth on the bike. Start the engine and briefly run it at around 1000 RPM. A good dynamo should give a minimum reading of 14V. If you rev' it harder the reading will increase,but don't do it or you could risk damaging the dynamo. I must emphasize that running the dynamo without the regulator must be done BRIEFLY. Edited by Dave P. - 16 Feb 2019 at 11:44 |
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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OK, next question, how accurate is the Voltmeter ... |
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"Chicken nuggets don't dance on a Tuesday."
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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Ahaa! Good question Mike. Other than comparing the readings of my digital meter with those of my analogue meters I don't know.
Please advise. Edited by Dave P. - 17 Feb 2019 at 19:34 |
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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jefrs
Senior Member Joined: 12 Aug 2018 Location: West Berkshire Status: Offline Points: 333 |
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Not have had a problem with the Guzzi but recently on Goldwing and Enfield EFI when the batteries were going flat for no good reason. The GL1800 seems to have been traced to two always-on dip beam H7 that were both blown (weird) and probably shorting, anyway fixing them stopped the 5A that was being constantly drawn. We're kinda at a loss to explain this one, it comes under the "have you tried kicking it?" category, or as NASA had it, "assist with lunar boot". On the Enfield even weirder because the battery tested 'good' by the man that sells batteries on his fancy battery tester but as soon as a small current was drawn it would drop to 12.2V or less. Small current like 1.7A which is the ECU and fuel pump etc. Which is unhelpful for the electric starter. Charging at 14.4V on the bike, which is correct here, would soon have it up to 12.8V, but then it would fall slowly when switched off. My test meter is a Fluke. Battery tests good but is not holding charge and can't sustain current. There is current available, enough to turn the engine over, but not at the right voltage. New one pickling down on the bench. We discovered that if you don't let them pickle, when you pull charge off they can froth up and dribble 10 molar acid onto chromed Honda exhaust. Point - battery faults are not always the most obvious. This is Sod's Law.
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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I think Mr Ohm's second name was Sod. The Enfield battery was just well past it's best. Fairly typical of a dying battery. Iv'e seen this recently on a 2.5 year old car battery. Showed good voltage, charged ok too, but as soon as any load was put on it the voltage dropped drastically. It does make me ask what test the battery seller did with his posh tester. Edited by Brian UK - 17 Feb 2019 at 22:14 |
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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One would hope a new PP3 battery would be good for a reasonably accurate 9 Volts. |
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"Chicken nuggets don't dance on a Tuesday."
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Ever checked a new AA cell? Never shows 1.5 volts. Most digital meters are pretty accurate. I have three, and all read the same, provided the internal battery is good. The analogue one can't be read with the same accuracy. I only have cheap meters, well actually the analogue was quite a good spec when I bought it 40 years ago.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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c13pep
Senior Member Joined: 31 Aug 2017 Location: Doncaster Status: Offline Points: 2110 |
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Much like my wife says about me then CHRIS |
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you can`t have any fun in a straight line
Monza Honda CB77 project |
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