21506646 Wiring Harness | Genuine Volvo Penta Part

🔧 Product Description

A conversion wiring harness used when replacing earlier thermo monitor 848829 with later monitor 21510547 on selected Volvo Penta D5 and D7 engines.

🚤 Compatibility

Typically suits:

• Volvo Penta D5A-B TA
• Volvo Penta D5A-T
• Volvo Penta D5A-TA
• Volvo Penta TD720VE PP
• Volvo Penta TD520VE
• Volvo Penta D7A-B TA
• Volvo Penta D7A-T
• Volvo Penta D7A-TA
• Volvo Penta D7C-B TA
• Volvo Penta D7C-TA
• Volvo Penta MD2010
• Volvo Penta MD2010B

• Engine Family: D, TD, MD

⚙️ Key Features

• Genuine Volvo Penta conversion harness
• Required with thermo monitor 21510547 in the specified conversion
• Adapts the earlier engine wiring arrangement
• Factory-sealed connectors
• Maintains correct temperature-alarm operation
• Engine type: Volvo Penta D5 or D7 turbocharged industrial diesel

🔌 Function

Adapts the engine wiring so the later thermo monitor communicates correctly with the alarm and protection circuit.

⚠️ Common Signs of Failure

• Temperature alarm does not operate correctly
• False over-temperature warning
• Open-circuit or short-circuit fault
• Damaged connector or wiring
• Incorrect conversion performed without the harness

🛠️ Service Notes

• Compare the new harness with the old one before fitting — check the connector types, the number of pins and the branch lengths, and lay it out alongside the old loom to confirm every branch reaches its component
• Disconnect the batteries before unplugging or fitting a harness, and support the loom as you work so its weight never hangs on a connector or a bulkhead grommet
• Route it along the original path and secure it with the original clips and ties, clear of hot exhaust surfaces, sharp edges and anything that moves; leave a service loop at each connector rather than pulling a branch tight
• Push every connector home until the lock latches and protect the joints with a marine dielectric grease — an intermittent electrical fault is far more often a partly seated or salt-corroded pin than a broken wire
• Renewing the harness is the right repair where insulation is chafed, brittle or oil-soaked, or where corrosion has tracked inside the connector bodies; patch repairs in a damp engine bay tend to fail again, and any single conductor that is repaired should be joined with tinned marine cable of the same gauge, a proper crimp and adhesive-lined heat-shrink

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 848829 → Superseded by thermo monitor 21510547
• 21506646 - wiring harness used with 21510547 when replacing 848829

OEM / Related Numbers

• 21510547 - 110 ±3°C thermo monitor
• 848829 - earlier 103°C thermo monitor
• 888853 and 21091609 - related sensors
• 3586736 - switch
• 21202753 - piston-cooling switch
• 20553463 - related sensor

📦 Condition

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