MAC TOOLS EM721 Manual Del Usuario página 43

•
Insert the black lead in the "COM" jack.
•
Insert the red lead in the "
Touch the black test probe to the negative (-) battery post and the red test probe to the positive (+) battery post;
this reading is the base voltage to compare your test voltage reading against.
Connect:
•
Black test probe direct to the positive (+) terminal on the starter solenoid.
•
Red test probe to the positive (+) battery post.
Press the "REC" button (selects the MAX.MIN.AVG function).
Disable the ignition so the engine can't start and crank the engine for four to five seconds.
This connection has two connectors and one wire; a voltage drop of more than 0.3V indicates a poor circuit.
Clean and inspect the battery cable connections and ground and test again.
NOTE: Repeat the test after the engine has thoroughly warmed up. Heat expansion may change voltage drop.
Battery Ground to Complete Starter Circuit (+) Voltage Drop Test
This test checks for battery power efficiency to the starter motor system including the starter solenoid. Even a
very low resistance in the starter circuit can cause the starter to turn slowly because of the high currents in the
starter circuits.
800.MACTOOLS
All manuals and user guides at all-guides.com
" jack.
12V Battery
Black
Red
Solenoid
43