Albrecht AE355M Mode D'emploi page 53

3. Connect the BLACK wire of the DC power cord to the negative side of the
vehicle (usually the chassis).
Caution: In vehicles with a positive ground, the RED wire connects to the
chassis and the BLACK wire connects to the accessory contact in the fuse box.
4. Insert the DC plug into the DC 13.8V jack on the back panel.
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