1993 Isuzu Truck starts sometimes and sometimes nothing

Just replaced the battery and tightened the leads as tight as possible but they can still move a little. I depress the clutch and it starts sometimes two or three times in a row but then I get nothing but a click sometimes also. I hope this could be just change the battery lead connectors to fix but could it be something else like maybe the starter or solenoid, or relay or clutch safety switch, is there an easy way to check these if you do not have a voltage meter, barring taking them off and taking them do the auto parts?