2008 Suzuki LT-A400/F, LT-F400/F ATV Service Manual, Page 11Get this manual
Precautions: Battery Battery connection in reverse polarity is strictly prohibitedSuch wrong connection will damage the components of the FI systems instantly when reverse power is applied 00-4
Never connect any tester (voltmeter, ohmmeter, or whatever) to the electronic unit when its coupler is disconnectedOtherwise, damage to electronic unit may result Never connect an ohmmeter to the CDI unit with its coupler connectedIf attempted, damage to CDI unit may result Be sure to use specified voltmeterohmmeterOtherwise, accurate measurements may not be obtained and personal injury may resultElectrical Circuit Inspection Procedure While there are various methods for electrical circuit inspection, described here is general method to check for open and short circuit using an ohmmeter and voltmeter
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Removing any battery terminal of running engine is strictly prohibitedThe moment such removal is made, damaging counter electromotive force will be applied to the CDI unit which may result in serious damage