Starter solenoid gremlin?
Vehicle 1998 Volvo V40 T4.
Occasionally, when I turned the key, I only get a single click and no turn over. It appeared to be a parasitic battery drain. I hooked up the test light in series with the negative post and cable. Pulled each fuse on at a time, and the light never went out. Hhhmmm... Next day, no problem.
I replaced the battery since it was old. Seemed worth the time/effort. I went for several weeks without a problem.
Yesterday, same thing. Only a click. I hooked it up via jump cables to the "good car" and initially, it wouldn't turn over... just a click. After a few attempts and about 20 minutes on the cables, it finally started... very strongly. It acts as if a switch has been turned off and on.
So... is it possible for there to be a problem inside the starter solenoid that is causing it to drain the battery... yet still work whenever it feels like it? Do solenoids fail intermittently?