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Repair guides and support for C/K pickup trucks sold by General Motors under the GMC brand, including the GMC Sierra.

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Will not start.clicks only with charger on.

Weirdly, when key is in start position odometer will begin to add miles. Vehicle was parked 5 months ago and ran fine and is in near mint condition with 190,000k km

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LOL! The odometer is a new one on me. Anyways, battery charger or battery charger with boost capabilities? After sitting for 5 months an older battery can totally lose it's charge and is a possible indication the battery is on it's way to where batteries go when they give up the ghost. Applying a battery charger without boost capabilities usually, in my experience, requires that the battery needs to be brought up to a certain voltage before attempting to start. Even boost chargers will display this on occasion too and some like my smart battery boost charger won't/can't connect to and start charging a battery with less than 1.5 volts.

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Donna Monford will be eternally grateful.
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