76 R90/6, no action when I hit starter button

[typ181r90]

glad you're back on the road

 

[Rod Sheridan]

Huh???

The starter relay ground circuit is through the alternator rotor.

Once the engine is running and the rotor has excitation, there's no return path for the starter relay coil.

It's the starter lockout function.

If you have poor brush contact or an open rotor, the starter relay won't energize................Rod.

 

[70816]

The starter relay ground circuit is through the alternator rotor.


...... HUH ??

 

[dennisdarrow]

I wouldn't bother unless you are at wits end and want to know for sure on that.

The /5 starter relay, as originally configured, has an analog logic circuit in the design to prevent engaging the starter while the motor is running. It is called the anti-restart circuit. If the motor is running and idling fast enough to dim out the charge light, the starter will not engage. One side effect of this feature is that there needs to be continuity thru the alternator rotor for the relay to engage the starter. I believe this function is unique to the /5 electrical system.

To test the rotor, you must remove the front cover and slip a business card between the brushes and the slip rings of the rotor and then set you meter to ohms to check for continuity of the winding.

Thanks for YOUR wisdom, knowledge, and attitude.......