Ford — Generator Voltage Test
Testing & diagnosis
From a Ford service manual — check it applies to your exact model before use.
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Procedure
- Switch the tester to the voltmeter function.
- Connect the positive lead to the generator A- terminal connector and the negative lead to ground.
- Turn off all electrical accessories.
- With the engine running at 2000 rpm, check the generator voltage.
- Voltage should be between 13.0-15.5 volts.
Tools required
- Rotunda Starting and Charging System Tester 078-00005 (VAT-40) or equivalent
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 13.0-15.5 volts at 2000 rpm
Source: Ford service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.