Blown Battery fuse.
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Vespa p200e
Joined: 15 Sep 2020
Posts: 3
Location: 84337
Tue Sep 15, 2020 3:50 pm quote
Hi. I'm a new member and I have a question. I have a Vespa P200E and it just started blowing the battery fuse every time I turn the key on. The battery is new and it was fine everything was working as it should for about 6 months, and then all of a sudden I went out to start it and I notice my tail light wasn't working when I turned the key so I check the fuse and it was blown. Now every time I turn the key on it blows the fuse. Any help would be greatly appreciated. Thanks.
Molto Verboso
Joined: 03 Nov 2011
Posts: 1072
Location: Racing Capital of the World
Tue Sep 15, 2020 4:18 pm quote
somewhere you are grounding out; could be anywhere within your wiring harness.
Lurker
Vespa p200e
Joined: 15 Sep 2020
Posts: 3
Location: 84337
Tue Sep 15, 2020 8:38 pm quote
I checked the wiring in the headset and the battery location and did see any bad wires.
Ossessionato
73 Rally, 74 Rally, 76 ET3, 80 P200, 06 PX150, 65 Li225 Silver Special, 86,95,96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3726
Location: Oceanside/ SF
Tue Sep 15, 2020 8:56 pm quote
Sadly you wont. Itís a pain in the ass but youíll have to check every battery powered wire one by one. Iíd start with the stator wires. Check the condition of the red wire where it enters the engine case below the electrical junction box. Then check the fuse holder, battery terminals, key switch. Thatís all the places DC power starts at. After that youre checking every wire on the DC circuit (lights, horn, turn signals, switches)
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Vespa p200e
Joined: 15 Sep 2020
Posts: 3
Location: 84337
Wed Sep 16, 2020 9:17 am quote
Thank you for all the help. I really appreciate it. I just tried a new fuse with the key off and it blew, so now I'm wondering what that could be? Now that I tested it with the key off does anyone know why it would blow a fuse with nothing turned on?
Ossessionato
Joined: 26 Oct 2015
Posts: 2633

Wed Sep 16, 2020 9:43 am quote
RevTony wrote:
Thank you for all the help. I really appreciate it. I just tried a new fuse with the key off and it blew, so now I'm wondering what that could be? Now that I tested it with the key off does anyone know why it would blow a fuse with nothing turned on?
I'm guessing it's the constant 12V ignition wire that's being ground out somewhere in the steering neck. That's why it could be popping fuses with nothing turned on.
Addicted
GL, PK, PE200 with hack, Sears Rust Badge
Joined: 24 Apr 2012
Posts: 912
Location: Deep in the heart of Texas
Wed Sep 16, 2020 10:11 am quote
Lets see a pic of your battery side of the scooter. Seems like something is connected wrong. The search should start where the fuse connection to the battery and work your way up.
Molto Verboso
2007 Stella 150
Joined: 02 Nov 2019
Posts: 1022
Location: Rochester, Minnesota
Wed Sep 16, 2020 11:31 am quote
Diagrams of wiring with fuse. In both diagrams you can find the fuse towards the bottom of the page.
If it were mine and I were troubleshooting this problem.

1) I would disconnect the wire completely from the ignition switch.

2)Depending on year I would disconnect it from the regulator or the junction box on top of the motor going to the stator.

3)Then you could use a multi-meter and measure resistance to ground and it should be an open, infinite etc. if it isn't you know the short to what is most likely ground is in those two wires.

4) An alternative to 3, use the blow a fuse method and see if it still happens. Not my favorite as you may wreck something else in the process.

5) Not sure what the wiring at the fuse looks like, if you still blowing a fuse at this point I would disconnect a wire or just cut it at the fuse You most likely pulling a new wire at this point anyway. As others have said I would start at the steering neck, headset area as the wiring flexes there and would be more susceptible to damage or normal wear and tear.

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Last edited by Christopher_55934 on Wed Sep 16, 2020 12:34 pm; edited 1 time in total
Ossessionato
1963 VBB2T
Joined: 07 Nov 2012
Posts: 2263

Wed Sep 16, 2020 11:56 am quote
I think Christopher has a good idea there , good chance a wire is pinched and disconnecting and isolation is going to find the bad one. Also you get to learn your wiring.
Molto Verboso
Joined: 03 Nov 2011
Posts: 1072
Location: Racing Capital of the World
Thu Sep 17, 2020 3:42 pm quote
whodatschrome wrote:
RevTony wrote:
Thank you for all the help. I really appreciate it. I just tried a new fuse with the key off and it blew, so now I'm wondering what that could be? Now that I tested it with the key off does anyone know why it would blow a fuse with nothing turned on?
I'm guessing it's the constant 12V ignition wire that's being ground out somewhere in the steering neck. That's why it could be popping fuses with nothing turned on.
Thatís what I figure too.
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