VAT-40 Testing

Charging System Schematic:

In order to check the charging system, the use of Rotunda VAT-40 078-00005 or equivalent tester is suggested. Connect the tester to the battery positive and negative posts and also connect the current probe to the alternator output lead (to measure alternator output). (When measuring alternator output, the tester can also be connected to the battery positive or negative cable. In this case, all electrical accessories must be turned OFF and 10-15 amps added to the reading on the tester due to the engine operation). With the engine running at 2,000 rpm, adjust the tester load bank to determine the output of the alternator. The alternator output should be near to, or exceed the alternator rating at 27°C (80°F). Checkout the charging system as indicated and service if required.