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@kb6emh avatar
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2016 sprint 150 / 2005 PX 150 / 2012 HD FXE
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@kb6emh avatar
2016 sprint 150 / 2005 PX 150 / 2012 HD FXE
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Location: Jonesboro Arkansas
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Can someone tell me approximately what the parasitic drain is in mA for a 2015 Vespa sprint? No options/alarm. Just clock and immobilizer.
Battery charges but goes down in about a week. New battery charge holds at 13.1v. Charge voltage is approx. 13.9v - 14.2. Alternator seems ok….not sure about voltage regulator.
Any help would be appreciated. Crying or Very sad emoticon
@chandlerman avatar
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Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 79 P200E, 66 Lammy S3
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UTC quote
One of the moderators should move you over into one of the more modern forums, but assuming the battery is good, you probably have a bad regulator.

There should be no parasitic draw when the bike is powered off.

How old is the battery? Is it possible it's just no longer holding a charge? The best way to test that is to charge it up, then disconnect the terminals and see what the charge bleeds off to over 12-24 hours.
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2016 sprint 150 / 2005 PX 150 / 2012 HD FXE
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Sorry about posting in not so modern. Battery is new. Holding at 13.1 v.
@chandlerman avatar
UTC

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 79 P200E, 66 Lammy S3
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Lucky
@chandlerman avatar
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74 Days Since Last Explosion
UTC quote
kb6emh wrote:
Sorry about posting in not so modern. Battery is new. Holding at 13.1 v.
No worries. I don't normally wander outside NSM, but I understand that our reputation is for being where the serious gearheads (and, I suppose, electricians) hang out.
@garncarz avatar
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Molto Verboso
1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1972 Suzuki T500J
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@garncarz avatar
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UTC quote
You can find it yourself. Start by connecting a milliamp meter in series to the positive battery terminal of your vehicle. Then, remove the fuses one at a time while watching for changes in the multimeter's reading. Once the reading drops, you've found the culprit and can take steps to repair it.
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@kb6emh avatar
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2016 sprint 150 / 2005 PX 150 / 2012 HD FXE
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Location: Jonesboro Arkansas
 
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@kb6emh avatar
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Location: Jonesboro Arkansas
UTC quote
Thanks to everyone for the help.
The draw on a Fluke 26III in series with the battery at rest is 5.6 mA.
Pulled all secondary fuses with no change BUT when I pulled the 10 A
Primary fuse, returns to 0. More investigation necessary. Charging is at 14.1 to 14.3v. Pulled the VR and still have parasitic drain.
Thanks again for the help.
@christopher_55934 avatar
UTC

Ossessionato
2007 Stella 225
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@christopher_55934 avatar
2007 Stella 225
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UTC quote
kb6emh wrote:
Thanks to everyone for the help.
The draw on a Fluke 26III in series with the battery at rest is 5.6 mA.
Pulled all secondary fuses with no change BUT when I pulled the 10 A
Primary fuse, returns to 0. More investigation necessary. Charging is at 14.1 to 14.3v. Pulled the VR and still have parasitic drain.
Thanks again for the help.
If I'm thinking about this correctly.

What is the battery capacity? A 5ah battery as an example should be able to withstand a 5.6ma draw for (5000ma/5.6ma=892 hours) or about 37 days.
@garncarz avatar
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Molto Verboso
1964 Allstate Cruisaire, 2022 Husqvarna Vitpilen 401, 1972 Suzuki T500J
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UTC quote
Christopher_55934 wrote:
If I'm thinking about this correctly.

What is the battery capacity? A 5ah battery as an example should be able to withstand a 5.6ma draw for (5000ma/5.6ma=892 hours) or about 37 days.
Your math is correct, but at < 50% battery capacity (really, anything under 11.5V) its unlikely to start. So if the draw is linear, let's call it 18 days. There has to be a short somewhere, or there is a computer cranking away. Not sure about new vespas. Electrical troubleshooting sucks.
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@kb6emh avatar
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Member
2016 sprint 150 / 2005 PX 150 / 2012 HD FXE
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Location: Jonesboro Arkansas
 
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@kb6emh avatar
2016 sprint 150 / 2005 PX 150 / 2012 HD FXE
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Posts: 21
Location: Jonesboro Arkansas
UTC quote
The modern bikes have a clock and immobilizer circuit so there has to be some draw at rest. Was hoping to find what this value should be.
Battery is factory replacement.
My Fluke and Simpson meter agree on draw, but 5 +/- mA seems excessive. If there was a short somewhere, I would think the current would be higher. Thought the VR might be leaking to ground.

Anyway….

Many thanks to everyone who responded.
Will ride my PX some until problem is resolved.
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