20563687 Control Unit | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta relay/control unit used in D5/D7 generator electrical systems, including glow-time control applications. It replaces earlier control-unit references and switches the corresponding electrical load.

🚤 Compatibility

• Engine Family: TD, TAD

Full model list at the end of this description.

⚙️ Key Features

• Application-specific Volvo Penta electronic control hardware
• Current relay/control-unit reference replacing 20518787
• Connector pinout, power supply and software data must match the engine serial number
• Processes sensor inputs and commands the documented relay, fuel or engine-control outputs
• Protected housing is designed for engine vibration and industrial operating conditions
• Programming or parameter transfer may be required after replacement
• Confirm grounds, supply voltage, network wiring and actuator circuits before replacing the unit
• Engine type: Volvo Penta D5/D7 inline industrial diesel family

🔌 Function

Processes signals and controls the corresponding electrical, fuel or engine-management function.

⚠️ Common Signs of Failure

• The engine will not start or enters a derate condition
• Multiple unrelated electrical or engine-control faults appear
• Communication with diagnostic equipment is lost
• Outputs to injectors, relays or actuators are missing or intermittent
• Water ingress, heat damage or internal electronic failure is present

🛠️ Service Notes

• A replacement control unit normally has to be loaded with the software and parameter set for your engine and installation before it will run — that is authorised-dealer work with Volvo Penta's own diagnostic tool, so plan the job around it rather than around the fitting time
• Isolate the batteries at the main switches and leave the system dead before disconnecting or connecting anything; back-feeding a live bus through a half-mated connector is a common way to destroy a new unit
• Treat the unit as static-sensitive and mechanically delicate: handle it by its housing, leave it in its packaging until it is going on, and never weld on the boat with control units connected
• Mate connectors clean and dry and push them fully home until the lock engages, then refit the harness clips and any shielding so the loom is not left hanging on the plugs
• Mount it in its own bracket and original orientation so the cable entries face as designed and water runs away from the connectors rather than into them

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 20563687 → Supersedes 20459871 → Supersedes 20499678

OEM / Related Numbers

• 20459871 earlier number superseded by this part
• 20499678 earlier number superseded by this part
• 20563687 → Supersedes 20518787
• 20563697 - Related Charge Air Pipe
• 20563945 - Related Seal
• 20563999 - Related Screw
• 20564378 - Related Spacer Sleeve
• 20555354 - Related charge-air pipe
• 20405950 - Related charge-air-cooler references
• 20585438 - Related charge-air-cooler references

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta TAD520GE, TAD520VE
• Volvo Penta TAD530GE MECH, TAD530GE EDC4
• Volvo Penta TAD531GE MECH, TAD531GE EDC4
• Volvo Penta TAD720GE, TAD720VE
• Volvo Penta TAD721GE, TAD721VE
• Volvo Penta TAD730GE MECH, TAD730GE EDC4
• Volvo Penta TAD731GE MECH, TAD731GE EDC4
• Volvo Penta TAD420VE
• Volvo Penta TAD532GE EDC4
• Volvo Penta TAD620VE
• Volvo Penta TAD722GE
• Volvo Penta TAD732GE EDC4
• Volvo Penta TAD733GE EDC4
• Volvo Penta TD420VE
• Volvo Penta TD520GE
• Volvo Penta TD720GE