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Message: <blockquote data-quote="RHoughton1" data-source="post: 5259203" data-attributes="member: 577807"><p>The draw back of hooking it up to the ignition on to the ignition source is that ,a/c ,turn signals, flashers,power windows all vary the voltage  ,which in turns will vary  the out put voltage of the alt.You get a more reliable and steady voltage from the alt or battery directly.It doesn't need amperage to work it just reads the voltage.</p></blockquote><p></p>

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