🚗 Classic Fault — Mercedes-Benz W115 (1968–1976)
Earthing strap failure causing electrical gremlins
💰 Estimated Repair Cost
$10 – $25 USD
Parts and labour estimate
🔧 Tools Required
Multimeter, basic tools
📋 Overview
The engine braided earthing strap corrodes or breaks causing high resistance in the ignition circuit, resulting in weak spark, misfiring, and various electrical faults.
🩺 Symptoms
- Weak spark
- intermittent starting
- misfiring that cannot be cured
- multiple electrical faults
🔍 Possible Causes
- Broken or corroded engine earth strap
- high resistance earth path
🛠️ Diagnosis Steps
Test voltage drop across earth strap — should be under 0.1V with engine cranking.
✅ Most Confirmed Fix
Replace engine earth strap. Clean both contact surfaces to bare metal.
80% of users confirm this fix worked (20 reports)
🏷️ Parts Needed
Braided engine earth strap
🔗 Other Mercedes-Benz W115 Faults
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