Brand and compatibility guide
DEFA Block Heaters
What DEFA engine heaters and MiniPlug cords are, why their connectors differ, and how to avoid ordering an incompatible replacement cord.
Our verdict
DEFA is best treated as a complete connector system. It is common on some European vehicles, but its compact MiniPlug components should not be mixed casually with North American cordsets.
Known for
- ✓ Compact MiniPlug vehicle inlet
- ✓ Engine-specific contact and immersion heaters
- ✓ Cabin-heater and battery-charger integration
- ✓ European OEM and aftermarket applications
Before you buy
- — Identify the vehicle inlet before buying any cord.
- — Do not assume a generic two-pin Zerostart cord fits a DEFA heater.
- — Use a grounded Canadian mains lead intended for the installed DEFA system.
- — For an unknown installation, trace the inlet cable to the heater or distribution block.
Find the right product family
DEFA products and useful alternatives
Amazon buying options
Zerostart 3600006 replacement cordset, 5 ft
Replacement cord only. Confirm that the installed heater manufacturer specifies 3600006; connector appearance alone does not establish fit.
Confirm the exact specification and application in the listing before ordering.
Cord / harness only — no heating element.
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Amazon buying options
Zerostart 3600116 lit-plug cordset, 5 ft
Illuminated replacement cord. Confirm that the installed heater specifies 3600116. The light indicates supply power, not proof that the element is heating.
Confirm the exact specification and application in the listing before ordering.
Cord / harness only — no heating element.
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Part reference
Digital multimeter with resistance and continuity
The definitive block-heater test tool. Any meter with an ohms range and audible continuity can isolate a dead cord from a failed element.
Confirm the exact specification and application in the listing before ordering.
No exact purchase listing verified yet. These links search Amazon; confirm the part before buying.
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Part reference
Automotive dielectric grease
A small amount around a clean weatherproof connector helps keep road salt and moisture out. It cannot repair burned pins or damaged insulation.
Confirm the exact specification and application in the listing before ordering.
No exact purchase listing verified yet. These links search Amazon; confirm the part before buying.
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Quick questions
Is a DEFA cord the same as a normal block heater cord?
Usually not. DEFA's compact MiniPlug system has its own vehicle inlet and cable components. Match the installed connector exactly.
Can I replace only the outside DEFA cable?
Yes, when the vehicle inlet and internal wiring test correctly. Replace the mains lead with the proper DEFA-compatible Canadian cable.
Why is a DEFA heater not listed on every Canadian vehicle?
DEFA coverage is application-specific and more common in European heating systems. A North American Zerostart or Kat's listing may be easier to source for some vehicles.
Which DEFA part fits your vehicle
The fitment pages list the catalogued kit and cordset numbers per engine, so you can check the part before you order it.