Dash clock resets when starting

Sounds like a fuse anything else not working probly a 5 or 10 amp fuse

 

Maybe the starter is "bad" and/or you have a secondary issue of a bad battery. Any decent mechanic can test the batteries (individually) and monitor the load on start to detect a bad starter but more then likely your current issue is a bad connection to the starter or solenoid if you didn't have the issue before changing out the starter. However, a bad starter can quickly damage a battery or set of batteries.

If you can easily get to all of the terminals at the starter and the solenoid, check they appear "clean" and are tight. The mechanic should have scrubbed the terminals clean before re-connecting for good measure.

Or maybe a bad voltage regulator if all else seems in order.

 

I'm guessing your batteries are on their way out. The new starter could take more juice to turn the truck over and causing the clock to reset due to lack of enough volts.

Try an experiment. After driving the truck for a few hours shut off the engine and restart and see if the problem still happens. Even if the batteries are no good there should be more then enough volts to start the truck and run the clock.

 

Its possible the power lead for your cab accessories is wired directly to your batteries, it might have a bad connection. You might try snugging up all your battery posts.
I'm sure the batteries were disconnected when the starter was replaced.

 

Voltage drop. As a last resort you can always run a new power wire and a new ground.

 

They don't normally disconnect all the batteries when replacing a starter. They just disconnect the one wire to the starter and put a little rubber boot on. Evern a rag or glove will do. No need to create all that extra work.

 

Either way at the least one battery post was disconnected, which is enough, if its related to his radio.

 

id put money on a bad connection, if there is enough voltage to fire off the ecm it should be keeping your time as well. so im guessing you have some additional voltage drop from a bad connection somewhere. some trucks use the starter as a power distribution block so to speak so check all your connections there as well as the battery's

if you cranked untill it cranked no more would be no surprise to loose your clock setting.