Fri Sep 24, 2021 9:45 am

Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
 
Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
Fri Sep 24, 2021 9:45 am linkquote
My just over 1 year old 300 had a dodgy battery that wouldn't hold its charge. Got it replaced a couple of months ago (annoyingly the warranty for batteries is only 6 months). However, this morning, tried to start it up after 3 days in the garage - no dice.

Tried jump starting it - pointless - bike dies as soon as the cables come off. I've just charged it fully so will see - however, what are the most common causes of battery run downs? The seat was closed so I don't think it was the light (the light switch is working properly). Might I have a short circuit somewhere? Unfortunately, the local dealership can't take the bike in for another month!!

On the cusp of going over to two wheels.
Fri Sep 24, 2021 10:39 am

Addicted
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 567
Location: Belgium
 
Addicted
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 567
Location: Belgium
Fri Sep 24, 2021 10:39 am linkquote
Check the battery terminals for "green death" a.k.a. corrossion.

This will cause battery drain even if the rest of your electical system is OK.

Remove the battery cables and using a wire brush clean the battery terminals and cables. Then apply some battery grease or even vaseline to keep moisture at bay.
Fri Sep 24, 2021 2:44 pm

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 40397
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 40397
Location: Pleasant Hill, CA
Fri Sep 24, 2021 2:44 pm linkquote
I don't have a wiring diagram for the 300 HPE, but assuming it's the same as the other MP3s, there is a 30A fuse between the regulator and the battery. On the 500 at least, this fuse is attached to the starter relay and known as the 'hidden' fuse - I have no idea if it's in the same location on the 300. If it is, this is a common cause of battery failure.
Sat Sep 25, 2021 1:29 pm

Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
 
Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
Sat Sep 25, 2021 1:29 pm linkquote
Thanks guys as always - I'll check the connectors. The fuse is a bit beyond me but I will mention it to the service guys.
Sun Sep 26, 2021 2:56 pm

Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
 
Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
Sun Sep 26, 2021 2:56 pm linkquote
jimc wrote:
On the 500 at least, this fuse is attached to the starter relay and known as the 'hidden' fuse - I have no idea if it's in the same location on the 300. If it is, this is a common cause of battery failure.
Discharged over a 48 hr period after I charged it fully on Friday night. Battery terminals not corroded. If the fuse is a common cause of issues, is that due to the fuse being blown and needing replacing?

Thanks
Sun Sep 26, 2021 10:04 pm

Addicted
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 567
Location: Belgium
 
Addicted
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 567
Location: Belgium
Sun Sep 26, 2021 10:04 pm linkquote
Have you had the battery load tested? If one of the 6 cells is bad, the battery is a goner.

Also, what type of charger are using? Motorcycle batteries require a very low Amp rate. Charging at more than 10% of the rated Ah will cook the battery. Most cheapo car chargers run at about 5-10Amp, which is 5-10X more than what the motorcycle battery can swallow.
⬆️    About 1 month elapsed between posts    ⬇️
Wed Oct 27, 2021 11:47 am

Member
Joined: 08 Dec 2020
Posts: 10

 
Member
Joined: 08 Dec 2020
Posts: 10

Wed Oct 27, 2021 11:47 am linkquote
I have a similar issue -- i had a separate thread on that.
A week of the scooter being unused and the battery dies.

This is a new motobatt battery, replacing the original yuasa after c 2 yrs.

The vehicle had a datatool tracker fitted by the previous owner that I am no longer subscribing for. I called the company up to deactivate it, to prevent 'pings' eating up thebattery. They said they did, but it didn't really change anything.

When I charge the battery up and then put it back in, things are good, except if i stop for 4-5 days, and then we are back to square 1.

For what its worth, the previous owner has removed the under seat bulb - so that isn't the culprit.
Wed Oct 27, 2021 2:37 pm

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 40397
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 40397
Location: Pleasant Hill, CA
Wed Oct 27, 2021 2:37 pm linkquote
Measure the parasitic current with a meter between the negative terminal and chassis.

Now remove fuses one by one - you'll soon find the culprit. And completely disconnect that datatool tracker...

What are you using to charge the Motobatt? It's an AGM battery, so needs to be charged at ~14.7V current limited to 2A. When the current eventually tends to zero, a float charge of 13.6V is beneficial.

A Battery Tender Junior won't cut it, I'm afraid, especially if the Motobatt has been nearly or fully discharged.
Wed Oct 27, 2021 6:45 pm

Addicted
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 567
Location: Belgium
 
Addicted
2015 MP3 500 ie Business
Joined: 29 Oct 2019
Posts: 567
Location: Belgium
Wed Oct 27, 2021 6:45 pm linkquote
^Exactly. You need a better & smarter charger like a Optimate 4 that monitors the battery every 30 minutes and conditions the battery continually to keep it in top shape.
Sat Oct 30, 2021 12:44 pm

Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
 
Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
Sat Oct 30, 2021 12:44 pm linkquote
Shop has diagnosed a busted relay which needs fixing. No idea what it means but it's covered under warranty.
Sat Oct 30, 2021 1:01 pm

Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 40397
Location: Pleasant Hill, CA
 
Moderaptor
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
Joined: 26 Aug 2007
Posts: 40397
Location: Pleasant Hill, CA
Sat Oct 30, 2021 1:01 pm linkquote
imadequavers wrote:
Shop has diagnosed a busted relay which needs fixing. No idea what it means but it's covered under warranty.
Ask for the old one back, take a picture and share it - it may well help the next chap to fall foul of this!
Sat Oct 30, 2021 1:06 pm

Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
 
Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
Sat Oct 30, 2021 1:06 pm linkquote
Will do.
Fri Nov 26, 2021 5:34 am

Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
 
Member
Piaggio MP3 300 HPE
Joined: 22 Aug 2020
Posts: 39
Location: Croydon
Fri Nov 26, 2021 5:34 am linkquote
Just by way of follow up - bike still at shop awaiting parts from Italy. It wasn't the relay so they've ordered a new wiring loom. This on a one year old bike with 2000 miles on it. Getting a little fed up and am looking at going Japanese (Rebel 500).
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