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Attwood 11901-4 12V/6V, 6A/2A Battery Charger download pdf instruction manual and user guide. 1.5A 1-Bank Battery Charger/Maintainer - Part Number 11900-4 (119004) by Attwood. Fully-automatic on-board charger provides a 1.5 Amp maintenance charge.OWNER'S MANUAL (MODEL #20028). 1.5 AMP Battery Charger & Maintainer Instructions For 6 & 12 Volt Batteries. Read Rules Carefully for Safe Operation.