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Old 10-27-2021, 01:07 PM   #1
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Unhappy Help getting power back in coach

Thanks in advance for any help offered. We drove our 2017 Allegro Bus for 6 hours yesterday using the inverter to run refrigerator... and yes everything electrical is dead. Plugged it in last night but didn't take a charge. We have looked at another post with what we hope may be a solution but here is such a basic question we hate to have to ask it. "where is the battery boost button? Is that the auxiliary start button?
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Old 10-27-2021, 01:26 PM   #2
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Yes the auxiliary button is used to boost the starting battery, but that won’t help your house batteries. Are you saying the chassis batteries are dead? Will the generator charge the batteries?
If it’s the house batteries, make sure the inverter is on and has not tripped a breaker. Does you Mh have a Spyder panel that has the inverter listed, make sure it’s on charge.
2018 Allegro Bus 37AP
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Old 10-27-2021, 02:22 PM   #3
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Your engine alternator should have been charging the chassis and house batteries when driving. The inverter draw down on the house batteries should have been replaced by the Alternator when driving.

"Every thing electrical is dead" if you have no 120v for the wall outlets and no 12v for lights and gauges:

1. Is your house battery switch turned to On?

2. Do you have power at the site power post? Is it turned to On?

3. If you start the generator (start the rig engine first) do you then get both AC and DC power?
1995 38' CC Magna #5280
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Old 10-27-2021, 02:58 PM   #4
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Okay I should have given more information and tell you we are pretty limited in our technology department. All your help is very appreciated. First the engine batteries are working, the generator won't start, and the magnam is reading 2.6. We saw another post that we tried to follow suggesting that we set the magnum shore power back to 5. press down the battery boost switch that is at the drivers side controls while running the engine at fast idle. We did this for approximately 3 minutes but nothing at all changed on the magnum display. If I am not describing adequately please let me know.
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Old 10-27-2021, 03:05 PM   #5
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I don't think we have a Spyder controller. We have a energy monitor up above the drivers seat in the cabinet where the inverter is but it is also dead. We are at our daughters house and have 50 amp service but we don't know how to test and see if it is coming into the coach.
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Old 10-27-2021, 04:06 PM   #6
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We do have power at the post. We are going to get a battery charger. When we do where do we hook it up to charge the house batteries? thanks for the help.
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Old 10-27-2021, 04:46 PM   #7
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If you ran the engine AND held the boost switch but didn't get a rise in voltage at the house batteries, the isolation solenoid or control for it isn't working.

Your magnum will not charge low or dead batteries. They need to be above 10 to 12 volts.

If you have jumper cables you can jump the chassis positive to the house positive. Use the posts that have the most cables on them, same if connecting a charger. That will bring the volts up on the house batteries.

If you can locate the isolation solenoid, you can check it out with a volt meter.
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Old 10-27-2021, 05:08 PM   #8
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So that I am understanding we connect only the positive chassis to the house batteries only? Also our cables won't reach that far they are too far away unless you know of a closer access. If not can we use a portable battery charger? Thanks you guys are great sharing your knowledge with others.
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Old 10-27-2021, 05:14 PM   #9
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I meant portable jumper not charger.
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