Engine Starter, 2010 Cascadia

Sounds like the classic sympton if either sticking solenoid on starter or sticking relay.

Sticking solenoids will do exactly as you described. But if there's relays. That could cause it also.

My 07 has a relay in the batteries and a relay mounted to the solenoid mounted to the starter.

I was told it's a relay. It could be 2 solenoids instead.

 

Illustration1 by 2hot2handle posted Oct 28, 2019 at 11:02 PM

Illustration-2 by 2hot2handle posted Oct 28, 2019 at 11:02 PM

Did you install a newer gear reduction starter (39 mt) with the relay on the solenoid of the starter? If so you might have not wired it correctly with the mag relay on your firewall.

From Delco Remy:
Integrated Magnetic Switch Relay

The final point is the Integrated Magnetic Switch (IMS) relay. The IMS reduces voltage drop and controls battery current to ensure the solenoid receives the maximum available voltage in any starting condition.

If the replacement gear reduction starter already has an IMS attached to the unit, then you need to leave the IMS on the new starter. You should never remove or uninstall it. Removal of the IMS may result in control circuit problems and will void your warranty.

However, the unit you are replacing may have an external magnetic switch already mounted on the vehicle’s firewall. If that’s the case, you have two options:

 

Sounds like a good solution. No need to spend the money on 1m mile Cascadia unless you plan to keep it for a few years.

 

On Cascadia’s the key does not operate the starter. It just sends a signal to the computer (SAM) to tell it that you want to start. The computer sends power to the magnetic switch.