Suburban 1998. Starts pretty good at first, but after a 30 minute drive it is sounds like trouble.
A good start usually has a quick series of short chugs, each getting stronger until less than a second goes by the engine is running.
A troubling start can sound like a couple longer/slower chugs, both sounding about the same, and then the third chug starts it.
I don't drive this vehicle often. I never do hear the solenoid click, but that doesn't mean there isn't one. I don't think there is any grinding sound -- certainly no high pitch screeching sound.
I have not yet watched for dimming/brightening of the lights during a bad start because I only recently realized the pattern. (good start when cold, bad when warm) The battery is less than a year old, but I will probably have it load tested anyway this weekend.
After the engine has been off for awhile, I can start the vehicle 6 times in a row and sounds like a good start each time, of course it gradually gets weaker (I assume that is due to battery drain).
Why do you think it would work better on a cold start, and not a warm start?