No Crank No Click - Deteriorated Starter Wiring and Ground Connections

Electricalintermediate✓ OP Confirmed

Problem

1986 MK3 Supra would not start at all - no cranking and no clicking sound when turning the key

No crank when turning ignition keyNo click from starter or relayBattery light active on dashboardVoltage meter not dropping when attempting to start (indicating no current draw to starter)Voltage meter fluctuating heavily when using turn signals while driving

Root Cause

Deteriorated and heat-damaged starter wiring and poor battery ground connections. The factory wiring had degraded over 30+ years of exposure to engine bay heat, resulting in high-resistance connections that could not deliver adequate current to the starter motor.

Confidence

Moderate confidence — Original poster confirmed this resolved the issue

View Original Thread →Posted June 2020 on SupraForums.com