11. Ignition Switch. There is no voltage regulator in this system. The battery acts as a voltage stabilizer. Because the battery is wired to the circuit in parallel, it need not be in the system in order for the lights to work. However, when the battery is removed, the lights work directly off the generator. Because the generator voltage is proportional to the engine R.P.M. it is possible for the light bulbs to blow out at high engine speed. The battery ground wire is connected to a black wire that runs up to the ignition switch. When the ignition switch is turned on, the battery is grounded. When the ignition switch is turned off, the battery is not grounded. If the ignition switch is turned on, and for any reason the switch is faulty and the battery is not grounded, the battery will not receive a charge. Also, because the battery is not in the circuit when it is not grounded, light bulbs may blow out due to the excessive current generated. To check the ignition switch, disconnect the ground wire of the battery from the black wire it is plugged into and remove the fuse from its holder. Clip one lead of the ohmmeter to the black wire and clip the other lead to ground. With the ignition switch in the "off" position the meter should read infinity. When you turn the ignition switch on, the meter should read zero. (Fig. 153) If the switch fails this test, check the wires on the back of the switch to be sure that it is wired correctly. If the wires are correctly installed, replace the ignition switch. Plug the ground wire of the battery back into the black wire and reinstall the fuse.

12. There always exists the remote possibility that one of the electrical components (horn, taillight, etc.) has an internal short and is putting an excessive load on the electrical system.

FIG. 153

13. To check this, disconnect the positive wire of the battery at the connector located between the fuse and the battery. The battery must have at least six volts to conduct this test. You will also need a DC ammeter. Clip the red, or positive lead of the ammeter to the end of the wire that has the fuse on it. Clip the negative lead of the ammeter to the end of the wire that goes to the battery. (Fig. 154) Turn the ignition switch on, but do not start the engine. Leave the light switch in the "off" position. Because there are no electrical components in use the ammeter should read zero. If it does not, there is a short somewhere in the electrical system.

Page 122