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Old 06-08-2023, 12:21 PM   #1
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Coach will not stay running

Hi I have a 1992 country coach model Magna. I have not used it for two years. I do go out and start it at least once a month. It always started and ran. This time the coach will start the dash does not wake up. I think this might be the problem. I thought it could be the coach batteries, so I replaced them. No luck.
Has anybody experience this?
Andy
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Old 06-08-2023, 06:21 PM   #2
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By starting the engine without driving it, the injectors may be severely fouled. It's best to not start the engine unless you can drive it for 20 miles or more.


At the dash not having power, look for and inspect the cable from the battery bank to the cockpit area for dirty or loose connections.
Years ago my engine would start but stay running. Turned out the be a loose 12V+ connection on the firewall that supplied power to the cockpit.
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Old 06-08-2023, 06:30 PM   #3
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The issue with the start / stall maybe related to the dash power or a problem with the fuel shut off solenoid .
Assuming that your engine is a Cummins with a P7100 injection pump that looks like the photo below.
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Old 06-08-2023, 10:26 PM   #4
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Quote:
Originally Posted by Skip426 View Post
The issue with the start / stall maybe related to the dash power or a problem with the fuel shut off solenoid .
Assuming that your engine is a Cummins with a P7100 injection pump that looks like the photo below.
Thank you I will check. It is a Cummins 300. Can you tell where the fuel shut off is located.
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Old 06-08-2023, 11:08 PM   #5
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Thank you I will check. It is a Cummins 300. Can you tell where the fuel shut off is located.
1992 Cummins 300 HP ; I believe what you have is a " CTA-8.3L " or a mechanical 8.3C , I'll see if I can confirm the engine series .
In the photo, of the injector pump I posted , its the gold colored part with the blue wiring attached .
It won't look so pretty on the engine .

The solenoid , is a dual function , when the engine is cranking , the solenoid lifts the fuel arm to allow fuel to the injectors , when the engine starts and the starter is no longer engaged the solenoid is powered from the ignition switch to lock allowing fuel to continue to flow , until the ignition is turned off.

The solenoid may be lacking power to " Lock " and may function properly once you have the dash working. But here's some info on the part and a photo of the location looking down from the bed room engine access.
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Old 06-10-2023, 03:02 PM   #6
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Andy; do you have any info on your coach's chassis manufacturer ?


Maybe someone with knowledge of the chassis brand can guide you to the chassis fuse box .

Sometimes the turn signal & 4 way flashers are mounted on the chassis fuse box , so tracking down those flashers by their noise might get you to the chassis fuse box.
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Old 06-10-2023, 05:24 PM   #7
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Hi Skip my chassis is GILLIG
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Old 06-10-2023, 06:06 PM   #8
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Andy, Skip 426 posted a photo of a Cummins C8.3L engine and the fuel shutoff solenoid.

The solenoid is located on the passenger side of the engine in a diesel pusher.

Try using some light weight wire to fasten the solenoid shaft in the most upward position. This allows fuel to flow. Then start the engine.

If the engine starts and runs, the shaft is likely not adjusted correctly. The Start magnet holds it up, but the Run magnet does not.

Shut the engine off by releasing the wire tension. Then adjust the shaft length to 2.6" below the solenoid plate when activated and fasten it to the throttle pin.
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Old 06-11-2023, 09:02 AM   #9
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Good this is also not be a clogged fuel filter? Any signs of algae bloom in the fuel?

IF the 'Bloom' has arrived... Power Services has some good products, and 'shocking' the tank would help get it under control. And mobile 'polisher's' of fuel might be another way to rid the Bloom! And of course, filter changes...

Good luck,
Smitty
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Old 06-14-2023, 03:41 PM   #10
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I had the same coach as you, itís still in the family in fact. If your dash is not powering on it could be the ignition relay causing your issues. Mine was going bad and would often not power on the dash or anything but would still crank over the engine. The relay is in the electric bay on the driver side.
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Old 06-26-2023, 02:17 PM   #11
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Coach will not stay running

Hi Nick sorry it's taken this long to respond. I appreciate your help.. I'm old like my coach so it is very difficult for me to work on my rig. I'm not sure of the location of the ignition relay. I toke two pictures of the electric bay. I hope one of them shows were the relay is.
A little description of what's going on: I turn the key and the engine starts, and runs for about 30 seconds stops. I try again and it will not start. The dash does not light up.
I put in new chassis batteries, did not help. My house batteries are two years old.
My coach is a Magna 1992.
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Old 06-26-2023, 02:54 PM   #12
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Ignition Solenoid

top picture big tin can.

wires 34e are from the ignition switch.

black cable might be a ground wire. Check for continuity to ground with your multimeter. Or use a piece of wire from solenoid to a new ground spot.

I bought a new solenoid 10 years ago. Still have it as a spare since the ground of the old one was what was bad.
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Old 06-26-2023, 03:01 PM   #13
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Hi Andy,
Exactly what Dean said, top picture with cable number 34. I think that is your issue. Should be able to cross reference at most auto stores or order online. Your issues sounds exactly like mine. Welcome to the forum as well. I don’t post much but look often and everyone on here is a wealth of knowledge. We had a 92 Magna, and now have a 2002 Magna.
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Old 06-27-2023, 07:30 PM   #14
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Those black wires are NOT ground wires. There is a black wire on each side of that solenoid. If that is the main ignition solenoid (???) then With ignition key OFF one black wire should have +12 volts battery power and The other 0 volts. With key ON then 34e receives 12v dc power from the ignition switch which causes the solenoid to close which should then provide 12vdc from one black wire thru the high power solenoid contacts to the other black wire which will then provide power to various circuits requiring 12 ignition power. The green wire should be the ground wire for the coil part of the solenoid. Hopefully this makes sense. Someone needs to confirm this solenoid is the main ignition solenoid. It appears it is but my coach has a different type of main solenoid. Good luck.
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