Perkins 403F-11 — Alternator - Test
Testing & diagnosis
For the Perkins 403F-11, from the Perkins service manual.
Applies to: Perkins 403F-11
Before you start
- Never operate the alternator without the battery in the circuit.
Procedure
- Connect multimeter positive lead to Bat terminal and negative to ground; put ammeter around positive output wire.
- Turn off accessories and fuel; operate starter motor 30 seconds, wait 2 minutes.
- Start engine and run at high idle.
- Check output current equals or exceeds minimum full load current.
- After ten minutes at high idle, output voltage should be 14.0 ± 0.5 volts.
- After ten minutes charging current should decrease to approximately 10 amperes.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 14.0 ± 0.5 volts
- approximately 10 amperes
Source: Perkins 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.