Author Topic: overcharge spike  (Read 1612 times)

Offline BSA500

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overcharge spike
« on: 04.09. 2017 09:10 »
Strange one. Was riding to work with the lights on when the ammeter showed a massive overcharge. Fuse blew. That protected the reg and lights. I understand how a short happens but over charge ???. Its a 12 volt dynamo, with dvr2 all quite new and a new battery reason/s ?

Online JulianS

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Re: overcharge spike
« Reply #1 on: 04.09. 2017 09:46 »
Sometimes a poor connection or frayed wire will cause a high charging rate to show on the ammeter. I would start with the basics and check all connections, bullet, blade and screw type.

Offline Bsareg

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Re: overcharge spike
« Reply #2 on: 04.09. 2017 09:47 »
D & F leads touching ?
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Offline BSA500

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Re: overcharge spike
« Reply #3 on: 04.09. 2017 10:23 »
I will go through the connections. I got the tool roll out of the tool box last night so I will check I haven't dislodged the reg wires etc.

Offline BSA500

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Re: overcharge spike
« Reply #4 on: 04.09. 2017 10:24 »
Oh the fuse did it's job and no damage :)

Offline Greybeard

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Re: overcharge spike
« Reply #5 on: 04.09. 2017 17:26 »
Was there a bright light in the sky? You may not want to share but did you get probed?

Offline mikeb

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Re: overcharge spike
« Reply #6 on: 05.09. 2017 06:50 »
must be a short or a regulator failure? even then you'd have to have some revs on. lucky you installed the fuse!

if you figure our what happened please post back - curious.
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Offline BSA500

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Re: overcharge spike
« Reply #7 on: 05.09. 2017 09:29 »
Still investigating. Did a quick check no visible issues. Rode it again with the lights on and after 5 miles with acceleration popped the fuse again. The only thing I have done is replace the rear light. I have since checked all the reg connections and replaced the rear bulb with the original one. I will check with lights off and if that's ok with lights on.

Offline BSA500

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Re: overcharge spike
« Reply #8 on: 05.09. 2017 13:25 »
Also did a continuity check along the F/D wires and that was clear.

Offline BSA500

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Re: overcharge spike
« Reply #9 on: 06.09. 2017 09:07 »
Ok ran it into work today no lights on and the charging/fuse were fine. I did check connections etc so I may have fixed it. I will run with lights on and see what happens. Fingers crossed.

Offline mikeb

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Re: overcharge spike
« Reply #10 on: 06.09. 2017 09:19 »
connections go lose/open. your problem is more likely a short... are there any old grimey clusters of connections? any infestations of electrical tape to clean out?
nothing like an intermittent wiring fault to test your patience  *conf*
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Offline BSA500

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Re: overcharge spike
« Reply #11 on: 06.09. 2017 12:32 »
the rear light connections were quite grimy with lots of black tape wrapped around it.

Online chaterlea25

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Re: overcharge spike
« Reply #12 on: 06.09. 2017 18:42 »
Hi,
Dipswitches are a favourite place to find short circuits *problem*

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Offline BSA500

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Re: overcharge spike
« Reply #13 on: 06.09. 2017 22:29 »
OK more testing.....
Lights off all things as they should be-slight charge showing battery fully charged
Pilot and rear light on- balances just fine no issues
Headlight on-pop goes the weasel
So headlight wiring/main switch/handlebar switch to check. Strange how it goes to over charge rather than shorts to discharge-or does the reg overcharge when more demand is made of the system. Anything else? also I need some more fuses  :!

Offline trevinoz

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Re: overcharge spike
« Reply #14 on: 06.09. 2017 23:42 »
It goes to over charge because the generator is feeding into a fault.
You are reading the output from the generator, not the battery.
Is your light circuit connected to the generator or the battery side of the ammeter?
If connected to the battery side, this will happen.