Yamaha Razz lekky starter problems

[jeremysprite]

Hi all
Trying to fix up/sell my Yamaha MK Razz 2000 scooter.
Kicks over and starts first time. Battery seems to be stuffed. I topped the water levels up a day or so ago and left it on the charger overnight, it said Charging but never charged.
Attached bike battery to leads on scooter, still no starter movement (Yes it is a 12V too)
I have one of those mini multimeters from DSE but dont know how to use it. There are three relay looking things that I could test, but not sure how...

Any help would be much appreciated!

[Guided_monkey]

Follow the large lead from the battery pos+.... it will go to the starter relay. The amps an engine starter draws is too much for your 'start' buton.

The starter relay will have 4 leads (maybe..... I know GN250's have only three).

There is the pos+ feed from the battery and another large lead going off to the starter.

The other two leads provide the power to trigger the relay.

The problem is that if your battery charger is not getting to fully charged state then the battery is more than likely farked.

You can test the voltage from the battery with the meter.... BUT this does not tell you what the battery will deliver when a load is placed in the circuit..... starter.

Hope this helps... good luck.

[Max Preload]

I assume you've checked the fuses?

To use the mulitmeter:
Set the meter to V (DC). Attach the black lead to a good earth (negative battery terminal or exposed metal on the frame, like a bolt - you can check if it's a good earth by changing the multimeter to Ohms and putting the other lead onto the battery negative terminal - if it's a low reading like less than 1 Ohm it's OK. If the multimeter is autoranging, pay attention to the range displayed, or turn autoranging off and set to just Ω (Ohms) not kΩ or MΩ.

With the black lead on the earth, put the red lead on the small wire going to the relay. Turn the ignition on - hit the starter. You should then get battery voltage (12V) displaying on the multimeter. If not, then it's probably the starter switch or a broken wire from the switch. Disassemble and clean the contacts and check for any broken bits.

If you have battery voltage on that terminal when the button is pushed, check the voltage on the relay terminal that the heavy lead from the battery coming from the battery connects to. It should be battery voltage whether the ignition is on or off. If it doesn't, the lead has a poor connection at the battery or is physically broken. But this is highly unlikely.

The other side of the relay has the terminal that carries the lead to the starter and should only have battery voltage when the ignition is on and the starter button depressed. If it doesn't have battery voltage under those conditions, the problem is in the relay.

If it has battery voltage on the relay terminal going to the starter when the starter button is depressed with the ignition on, check for battery voltage at the starter end of that cable under the same conditions (ignition on, starter button depressed). If it's got battery voltage, the problem is in the starter, probably just worn brushes. If it doesn't have battery voltage both ends, the lead to the starter is faulty.

Hope this helps.

[jeremysprite]

Cheers, got it going.
I bought a new relay for it, and so the old one decided to go again... typical. Not sure what I was doing wrong but Ill keep the lesson on the multimeter for future reference... much obliged.