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fresh battery, juice, but no turn over

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I've had my DRZ 400sm parked all winter and have not started it yet. I have a new, fully charged battery, put in new gas, and replaced the tail light before firing it up. The lights are strong, new tail light works fine, but when I try to crank it, the headlight dies and nothing happens. I checked the charge on the battery and unplugged all the wires to the rear lights just in case I messed something up there. What could it be? Any help appreciated, I am not a very experienced motorcycle mechanic and don't want to take it to a shop for somthing simple. Thanks a lot.

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With those symptoms, I would first suspect a weak battery, but you say it's new and fully charged. Check the connections for the battery and starter. If your battery is good, a bad ground can cause this.

You might want to try jumping it with another battery. If you use a car battery for this, make sure the car is NOT running because its charging system puts out too much for a motorcycle.

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On the US S/SM (I beleieve the CAN ones are the same), the lights go off when the E button is pressed. Put a voltmeter on the battery, key off, get a reading, then key on, get a reading, then press the button, take a reading. If the voltage is steady or even goes up when the button is pressed, it is either a bad wire betweent the button and starter relay or a bad relay.

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It sounds like an interlock problem. Side stand up, key on, clutch pulled, kill switch on, press start. If no problem there, check for voltage the the starter relay and use a jumper wire to bypass the whole interlock system.

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