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03-10-2019, 09:32 PM | #16 |
Registered User
Join Date: Mar 2010
Location: Beachtown
Bike: M900
Posts: 2,188
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Sorry this has been a while coming- work and stuff kind of took over for a while.
Anyway, here are my findings for my 1997 M900 with a Motobatt 16Ah battery, single phase 350w alternator and the original regulator/rectifier- Static voltage after two weeks of sitting un-used: 12.80v Tick-over lights off: 14.90v Tick-over lights on: 13.50v 3000rpm lights off: 15.00v 3000rpm lights on: 15.00v *Note: Revving higher than 3000rpm made no difference to the measured voltage. By comparison my 1996 Yamaha YZF600R Thundercat with an unknown make 12Ah battery (it came on the bike when I bought it November 2018), 3phase alternator and it's original regulator/rectifier- Static voltage after three weeks sitting un-used: 12.93v Tick-over lights off: 14.47v Tick-over lights on: 14.45v 5000rpm lights off: 14.25v 5000rpm lights on: 14.05v *Note: Revving higher than 5000rpm made no difference to the measured voltage. The Yamaha's results were quite interesting as the Haynes manual doesn't give an output for the alternator in Watts like they do for the Ducati but states it as 18.1amps and gives a battery charging voltage at 5000rpm as 14.70v which mine is a little under but has less than 0.5v difference under all conditions while my Monster has a 1.50v difference. Going on from this, I have tonight bought home from work, a 'Current Clamp' meter which (assuming it will read at those frequencies) I shall be able to measure the current from the alternator on both bikes which should show up just how undersized the wires are on the single phase Ducati. I will post up further results when I get them.
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03-10-2019, 09:55 PM | #17 |
Registered User
Join Date: Apr 2017
Location: Dublin Ireland
Bike: M900
Posts: 298
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Great info thanks
My battery got very low after sitting up 3 days and one night was very cold Just about started , drove into work (13 miles), was difficult to get it started after work due to lack of power in the battery Does not seem to get enough of a charge within the 13 miles |
03-10-2019, 11:47 PM | #18 |
Too much time on my hands member
Join Date: Jan 2013
Location: Shipbourne
Bike: M900
Posts: 1,421
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Not sure if you have changed this cable yet but the one to the starter motor, if the connection on the post is seized be very careful. If the post turns in the body of the starter motor it pulls the connections from the brushes and it gets very messy (expensive) when you eventually get inside the starter motor. Do not ask me how I know.
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04-10-2019, 08:57 AM | #19 | |
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Join Date: May 2007
Location: Stockbridge
Bike: M900
Posts: 1,984
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Quote:
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04-10-2019, 09:27 AM | #20 | |
Registered User
Join Date: Jun 2018
Location: Clevedon
Bike: M1200s
Posts: 560
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Quote:
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07-10-2019, 07:53 AM | #21 |
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Posts: n/a
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The difference of .75 of a volt or so is just the tolerances in the voltage regulator.
You could buy four identical regulators and they would all vary slightly. |
19-10-2019, 05:43 PM | #22 |
Registered User
Join Date: Apr 2017
Location: Dublin Ireland
Bike: M900
Posts: 298
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Last Saturday, charged battery fully on a trickle charger , went for a good spin, parked up , came back after an hour , bike would not start (Starter button did nothing) , I started to scratch my head , I could not leave it in town, would get lifted over night, fiddled with the cables, all of a sudden the starter button fired it into life
Went home I took the battery out to see if something was loose on the starter solenoid ; turned out the 2 pin plug on the starter solenoid came loose I said , lets get this fixed once and for all , cannot relax thinking , will it start again if I take this out for a spin Sanded the OE loom Cable (looked fine, just slightly tarnished, light coffee colour) Cable to the starter Solenoid is new (this was replaced 2 weeks ago) Ground Cable is a new OE cable from during the summer Starter Solenoid is new from the Summer LED Battery Health indicator is new from the Summer(trickle charger quick connect on it & led looks like an Alarm) I still have to replace the Starter Solenoid to Starter Motor cable Greased up all the cables/battery posts with electrical conductive paste, ensured the OE Loom + cable was the first on the post , followed by the new cable to the starter solenoid , then the Tracker eyelid on top, then the eyelid for the LED battery health indicator took it for a spin , no issues , no hesitation (misfiring); she looks a fully charged battery Left it for the week with the expectation the battery will be flat , I headed out with the intention of having to remove the battery to charge it Bike started fine today , was sitting up a full 7 days I presume the arrangement of the cables on the battery post made a difference to the charge across the battery Last edited by CarloL; 19-10-2019 at 05:46 PM.. |
20-10-2019, 02:59 PM | #23 |
Registered User
Join Date: Apr 2017
Location: Dublin Ireland
Bike: M900
Posts: 298
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Installed the uprated Ground cable today , put it all back together ; hit the starter button nothing
Strip it all again , to get at the suspect 2 pin plug on the starter solenoid It was not loose this time , looks like it is corroded (green has formed on the contacts) Filled it with conductive gel , works again What do you guys do with corroded pins like that ? Its near impossible to get at the metal butt connectors due to the plastic enclosure |
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