1974 Johnson 115 HP Starter Troubleshooting

[kax2000]

What is the proper procedure to troubleshoot a suspected failing starter while on the motor? Are there voltages i can check?
The starter motor will work "normally" sometimes and other times will be so sluggish it cant start the motor. Same battery

Thanks in advance for any help.

 

[oldboat1]

Attempt to jump start directly from your car or truck. Pos to post on the side of the starter, neg to starter bracket.

 

[boobie]

Before condemning the starter check your battery, battery cables and ALL cable connections.