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06-16-2021, 04:36 PM
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#1
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Senior Member
Join Date: Aug 2019
Location: Lake Travis, Texas
Posts: 182
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Electrical Gremlins
Help!!!!!! On the road from Texas to Maine and started having electrical issues. If generator is running, engine will not start. Turn off generator and it starts right up. Any ideas????
Battchief
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06-16-2021, 05:01 PM
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#2
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Senior Member
Join Date: Mar 2016
Posts: 2,990
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Loose grounds is always something that comes to mind when weird electrical stuff happens
__________________
2016 Dynamax DX3 - Big Blue
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06-16-2021, 05:02 PM
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#3
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Senior Member
Join Date: Oct 2018
Location: San Jose, CA
Posts: 998
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Could be a number of things..
Look for a breaker in the house battery compartment. If the flag is showing the breaker has tripped.
Could also be a dead battery, What is the voltage on the Chassis Battery?
Also check your house batteries they are they dead?
__________________
2019 FR3 33DS Motorhome
650 Watts Solar, 400Ah LIFEPO4, 2000 Watt Inverter, 40A DC/DC Charger, SumoSprings, Roadmaster Steering Stabilizer, BlueOx Trac Bar, Truma AquaGo WH, NVIDIA Shield TV
Days Camping
2019 57:2020 20:2021 30:2022 46:2023 47:2024 7
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06-16-2021, 05:39 PM
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#4
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Senior Member
Join Date: Aug 2019
Location: Lake Travis, Texas
Posts: 182
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House batteries are fully charged so onboard charger is working. Went ahead and replaced chassis battery with new OEM AGM. Started right up. Then started generator and tried to start. All the usual bells and lights but when key turned to start, nothing. Turned off generator and engine started immediately. All breakers fine. Everything electrical works well, not sure source of gremlin.
Battchief
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06-16-2021, 05:47 PM
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#5
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Senior Member
Join Date: Aug 2019
Location: Lake Travis, Texas
Posts: 182
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So the only difference I can come up with is when generator is running, charger is on and chassis battery is receiving charge. What I can’t figure out is what difference that would make.
Battchief
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06-16-2021, 07:34 PM
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#6
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Senior Member
Join Date: Aug 2016
Location: Canyon Lake, Texas
Posts: 1,824
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My guess would be the BIM somehow cutting power from the chassis battery?
__________________
2021 Isata 5 30FW
2022 Ford Ranger Tremor 4x4
(Previously owned a 2017 Isata 3 24FW)
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06-16-2021, 09:04 PM
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#7
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Senior Member
Join Date: Aug 2019
Location: Lake Travis, Texas
Posts: 182
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I think the BIM 225 is a possibility. Considering disconnecting chassis battery from BIM until I can replace. House batteries won’t be charged going down the road except for solar but plugged in every night and chassis battery will only be charged by alternator but driving every day. Thanks
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06-17-2021, 11:01 AM
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#8
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Commercial Member
Join Date: Nov 2007
Location: Bristol, IN
Posts: 19,006
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What if you start the chassis....then start up the gen???? What happens then?
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06-17-2021, 02:52 PM
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#9
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Senior Member
Join Date: Aug 2019
Location: Lake Travis, Texas
Posts: 182
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Good question. Starting well now but have not tried starting first then starting generator.
Battchief
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06-17-2021, 04:37 PM
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#10
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Senior Member
Join Date: Jan 2021
Location: Fort Mill SC
Posts: 344
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Does the engine start if you are on shore power, generator off?
This might help determine if 120V related or generator related.
__________________
2021 Isata 5 28ss 4x2 / 2020 JLU Rubicon
Prior: 2016 Lance 1995 / Ram 1500 Eco Diesel
2012 Lance 1575 / 2015 Jeep JKU Rubicon
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06-17-2021, 05:19 PM
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#11
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Senior Member
Join Date: Aug 2019
Location: Lake Travis, Texas
Posts: 182
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Have not tried that either. I asked bclemens if there was a lockout for either genset on or shore power connected, thinking that the issue may be related . He told me there are no lockouts for either situation. This is one reason why I own a Dynamax. The GM is available for answers. I will try and see what happens.
Battchief
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06-17-2021, 06:02 PM
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#12
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Senior Member
Join Date: Jan 2017
Posts: 3,290
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when the generator is 'running', it is producing 120v power, and sending it back to your Breaker Panel, which should have absolutely nothing to do with your Vehicle's ENGINE, or the IGNITION.
Although, when you look at how a motorhome is built, there are several things that sometimes 'combine' these two systems together - the AUX or EMERGENCY START switch, usually located on your dash. This provides you the ability to COMBINE your Chassis AND House battery banks to help start the Vehicle's engine, or the Generator, when either battery bank might be low, or not able to on it's own, since they both use DIFFERENT battery banks to start each.
I'm wondering if there is an inline device that is somehow not working properly when either the generator or the engine is already cranked.
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