The Stovebolt Site Forums The Shop Area Engine Shop 1969 C10 - Engine Blow-By Pressure Vs. Fuel Pump (Pictures posted)

********* "No Start When Hot" riddle finally solved ******************

I went ahead and installed new 02AWG heavy duty battery cables, just to end the chance that they may have been defective:

[img]https://www.stovebolt.com/ubbthreads/ubbthreads.php/ubb/download/Number/18304/filename/STA77180.JPG[/img]

[img]https://www.stovebolt.com/ubbthreads/ubbthreads.php/ubb/download/Number/18305/filename/STA77185.JPG[/img]

The new Voltage Regulator was installed a couple days ago:

[img]https://www.stovebolt.com/ubbthreads/ubbthreads.php/ubb/download/Number/18306/filename/STA77192.JPG[/img]

Took the 69 C10 on a 30 minute drive today, and turned the engine off.........then turned the key, and she cranked right up with no issues.

So I am "hopefully certain/ 98% positive" that the "No Start When Hot" issue is solved. The Voltage Regulator had been charging at around 18 volts, boiling and internally screwing-up the battery plates. With the engine warm and the battery screaming mad at holding 18 volts, I think this internal heat totally destroyed the amperage ability of the battery......and thats why the starter barely turned over the engine. Now that it is charging at the proper 14 volts, the battery has the amperage power to crank the engine when warm. However, I think this battery has been damaged from this excessive overcharging......I put a battery load tester on it and it is right at the borderline area of being "Weak", and it does not want to hold a solid 12.6 volts, but will drift downward to 12 volts, even with the battery disconnected. So, will be getting a new battery soon.

However, this really does not explain why the engine was harder to manually crank over by hand when it was warm.

Glad you got it solved!

The bad cables can be hard to visually diagnose, the voltage drop test will give you a very good indication of cable condition should you ever have to deal with this in the future, a couple minute diagnostic procedure will save you guessing.

Only thing left to do is enjoy the truck.

Jeremy

74Jer........Thanks. I sure hope the problem is solved. If so, its time to order a new radiator, as the original one has been leaking a bit over the past 10 years.......just trying to squeeze as much life as possible out of it. Ha ha.

Enjoy the truck.......well, a huge enjoyment just being able to turn the key off, run into the parts store, and know the engine will crank right up......thats sheer enjoyment right there.

I just read the entire thread and i feel like i just ran a marathon! 😄 i love happy endings.

VinoRon.......Yea man.......Alot of reading there for sure, and alot of wierd problems happening all about the same time......those gremlins were having a hay-day with me. I "think" all the problems are solved at this point, and will report back if that "No Start When Hot" issue comes back.

Now all I need is for that darn Koronna Virus to infect my poor 50 year old Chevy C10.......they say its harder on the elderly.

See ya.