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  #1  
Old 4 Weeks Ago
Gravitas Gravitas is offline
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Default Electrical problems.

Hi,

Well the non-starter now runs.Which is great. I have run it for a minute or two twice.

But I had an intermittent electrical problem that means there was no power. Intermittent means with no power sometimes by moving the wiring this seemed to cause the power to come back.

Last time, the electrics were on, tested my front break switch it worked. Touched the start button, Starter clicked once and everything died.

With the key inserted, but not turned, I measure 12V across the battery terminals. And the same across the circuit breaker and at the ignition switch.

With the key turned (once, or twice) I measure 0V at the battery (and at the circuit breaker and ignition switch)

Would that mean a short circuit?

I would like to trace and rectify the problem. The wiring looks messy and I will re-wire at some point, but not yet.


Any pointers please?


Regards


Paul
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  #2  
Old 4 Weeks Ago
Captain Johnny Captain Johnny is offline
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I would fix "messy" wiring first but is the battery old or new? An old dead battery with a recent charge will do what you said happens.
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I have removed the battery and am using a portable jump charging battery. Which is what started the bike. Since I can measure 12V, Switch on measure 0V, Switch off measure 12V i guess the battery pack is OK, there should at least be some lights on. The actual battery measures 4-5V and I will replace it with a Li-Ion one in due course.

At the moment I am trying to keep it simple.
But, I am attacking a learning curve:
How much choke, throttle twist etc. to apply to start it...
Previously, fighting to start it, with intermittent electrical problem, starter just clicks sometimes, sometimes turns over and has started.
Messy (that is very polite) wiring. No visible fuses (looks like they are under heat shrink cable joiners) and duck tape round a bunch of other stuff. Breakers not in the holders on fender etc.
Now dead power.
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  #4  
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I would suggest you look at the wiring on your switches & look for a broken, loose wire, look for a wire shortening out, burnt wiring.

Did the circuit breakers click in & out when you giggled the wires or when you hit the start button?

Take photos, draw diagrams before you start pulling wires off.

Did you check your charging system at all?

I assume you have a multimeter, a must for any tool box.

Regards,

Andy.
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I will double check the right hand switchgear since it is currently open.
I have not noticed hearing the Circuit breakers click.
I will take photos, and I have the original wiring diagram and the other diagrams from the forums.
Can't check charging until I have it running properly.
Multimeter yes I have one.

Regards

Paul
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Default

If the battery is OUT, then where did you measure Battery Voltage?


When you're having issues with the electrical system, use this Sportsterpedia section about
checking the battery cables, voltages and grounds - DO THIS BEFORE ANYTHING ELSE:
http://sportsterpedia.com/doku.php/t...place_to_start

General Diagnostics - Including Won't Turn Over & Won't Start
http://sportsterpedia.com/doku.php/t...k:ref:genmsr01


BE CAREFUL - Trying to run the electricals with a dead short on any wiring is a potential FIRE HAZARD!!! A battery is capable of 200amps or more of power & WILL MELT INSULATION and the wiring BECOMES RED HOT LIGHT BULB!!!


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The "actual" battery looks shot. I am using a "portable" fully charged battery.
I'll follow the links and get back.
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Any and all electrical testing begins with a good load tested fully charged battery.

Starting a bike with a jump box and then running it with a shot battery can cause all kinds of issues. So your best staying on the lift until you get a good battery in it.

The charging system replaces power taken from the battery, it was never intended to be the sole source of power and cannot be relied on as such. You can add a capacitor to help some, but I doubt an electronic ignition would be happy.
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I'm off to get a charger to see if the brick is revivable. If it isn't i'll get another Lead-acid, the price of LI-ion and a potential new regulator to keep it happy does not make sense at this time.
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I would recommend buying a sealed gel battery, zero maintenance, install & forget about.

Also invest in a plug in trickle charger, like an Optimate 4, for when the bike is not being rode, keeps the battery topped up & healthy, good investment.

Andy.
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