1984 240 L4-2127cc 21L SOHC B21A (Canadian) Battery Testing Flow - Page 2247
Voltage measurement
A voltmeter is connected in parallel with the test component.
Connect + to + and - to -.
Current measurement
An ammeter is connected in series with the test component. Connect the positive terminal on the instrument to the point with the highest potential.
Where the current is likely to be high, a shunt should be connected in series with the test component to prevent damage to the instrument. The ammeter is
connected to the shunt.
The ammeter and shunt are often matched so that the true value of current is obtained by multiplying the indicated reading by a specified shunt factor.