A 2006 Lincoln Town Car has a rebuilt alternator producing dangerously high voltage (15.5-17V), and the owner needs reliable diagnosis and replacement guidance to avoid electrical damage.

Free testing at AutoZone only provides a pass/fail result without detailed voltage readings, so the owner cannot rely on it to diagnose an overcharging alternator. No bench test or multimeter use is offered, leaving the owner without definitive answers.

Severity

4High

Willingness to Pay

implied

Added

May 22, 2026

App Concept

AltCheck Pro

AltCheck Pro is a mobile app that guides DIY mechanics through step-by-step alternator and battery diagnostics using their phone's voltage readings (via Bluetooth OBD adapter or manual input). It compares real-time voltages to specifications for their specific vehicle, provides clear pass/fail conclusions, and recommends replacement parts with links to purchase. Unlike free store tests, AltCheck Pro gives accurate, actionable results.

Key Features

Vehicle-specific voltage specifications lookup by make/model/year
Guided multimeter test sequence with visual indicators
Symptom-based diagnostic decision tree
Direct links to purchase quality replacement alternators and batteries
Report generation for shop visits or warranty claims

Target Users: DIY car owners and shade-tree mechanics working on older vehicles (pre-2010) who need accurate alternator and battery diagnostics without paying for a shop visit.

Revenue Model: Free with basic diagnostic tree; $4.99 per vehicle report; $9.99 monthly subscription for unlimited reports and premium features (OBD integration, saved vehicle history).

Existing Solutions Mentioned

AutoZone free testing machine

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