Cummins ISL400 runs and quits... questions
I'm currently stuck in a RV campground with a engine that won't run. I called and talked with the nearest Cummins service center and the tech on the phone says he thinks it's the lift pump. The pr...
Forum Discussion
Interesting that your problem had nothing to do with the engine side of things.
You will find that turning the engine battery disconnect off does NOT disconnect the engine starter from the batteries. That switch is not capable of 1800 amps. I only learned recently that Monaco puts both of the starters on the same batteries so if the generator will not start... you are in trouble even holding the boost switch down for 10 minutes. Instead of running a large battery cable to the back and the house batteries, they tap into the large engine battery cable in the front left compartment for the generator. With dead engine batteries the BigBoy and wiring will not pass enough amps (200 amps) to overcome the dead batteries and start the generator. Instead of unhooking the engine batteries (hard to get to because of "How I tow", I cranked up the toad and turned on the parking lights and let it and the boost switch charge the engine batteries enough to finally get the generator to start and then the converter would charger the engine batteries enough to finally get the engine started.
The Big Boy has replaceable contacts so no reason to buy a new one unless the electromagnet does not pull the round disk into the contacts. Any good starter repair place should have these contacts that bolt into the solenoid and are what the large copper straps bolt to. A simple test is to see if you have any voltage between these two large studs when someone hold the boost switch on. You should not have any voltage as it's just a on/off switch. Another indication would be that your house batteries are not being charged when going down the road.
A friend with a 06 Exe could not boost his engine start and by removing these studs/contacts and taking a file to the corrosion on them we had him running in less than an hour.
You will find that turning the engine battery disconnect off does NOT disconnect the engine starter from the batteries. That switch is not capable of 1800 amps. I only learned recently that Monaco puts both of the starters on the same batteries so if the generator will not start... you are in trouble even holding the boost switch down for 10 minutes. Instead of running a large battery cable to the back and the house batteries, they tap into the large engine battery cable in the front left compartment for the generator. With dead engine batteries the BigBoy and wiring will not pass enough amps (200 amps) to overcome the dead batteries and start the generator. Instead of unhooking the engine batteries (hard to get to because of "How I tow", I cranked up the toad and turned on the parking lights and let it and the boost switch charge the engine batteries enough to finally get the generator to start and then the converter would charger the engine batteries enough to finally get the engine started.
The Big Boy has replaceable contacts so no reason to buy a new one unless the electromagnet does not pull the round disk into the contacts. Any good starter repair place should have these contacts that bolt into the solenoid and are what the large copper straps bolt to. A simple test is to see if you have any voltage between these two large studs when someone hold the boost switch on. You should not have any voltage as it's just a on/off switch. Another indication would be that your house batteries are not being charged when going down the road.
A friend with a 06 Exe could not boost his engine start and by removing these studs/contacts and taking a file to the corrosion on them we had him running in less than an hour.
