Service Manual

ELECTRICAL

7-3TimeCutter® Z/Precision® Z Service Manual

How It Works Testing

1. Disconnect the solenoid from the wiring harness.

2. With a multimeter (ohms setting), check to ensure

that terminals “c” and “d” are open (no continuity).

3. Apply +12 VDC to terminal “a” and ground terminal

“b”. Terminals “c” and “d” should now be closed

(continuity) (Fig. 435).

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is wrapped around an iron core. Whenever 12 volts is

applied to the coil, it becomes a magnet. The other part

is a bar type switch. Because it has a large contact area

with the contact terminals, it can easily handle the high

current loads required by the starter motor of the engine.

When 12 volts is applied to the coil, it becomes an elec-

tromagnet. This quickly pulls the contact bar toward the

contacts and closes the switch. When power is removed

from the coil, the spring loaded bar returns to its

“normally open” position. The solenoid closes and opens

the switch very quickly. This minimizes the “arcing” that

can damage other types of switches.

The ignition switch is protected because only a small

amount of current is needed to activate the coil.

Fig. 435 xl solenoid

A & B Coil terminals C & D Contact terminals

4. You should be able to hear the solenoid switch

“click” when you make the connection (Fig. 436).

Fig. 436 PICT-9803