The Peugeot 806 originally had 1.9 turbo-diesel or 2.0 petrol engines. The following pages contains detail explanation and description regarding the Peugeot 806 DHX (1.9 turbo-diesel) Engine Wiring Diagram. Included in this explanation: battery, air conditioning ECU, alarm starter cut-off relay, starter, alternator, instrument panel, engine compartment fuse box, ignition switch.