Good Sam Club Open Roads Forum: Aux Start to Boost Cranking Amps
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 > Aux Start to Boost Cranking Amps

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gb76087

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Posted: 03/27/21 06:26pm Link  |  Quote  |  Print  |  Notify Moderator

2007 Fleetwood Terra, F53 chassis.
The coach has Power Gear electric leveling system which requires a very healthy chassis battery. If the chassis battery is weak, the jacks don't work.
My question is if the chassis battery is weak could I hold the auxiliary start switch(the engine is running) and retract or extend the jacks at the same time?


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chuckftboy

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Posted: 03/27/21 07:10pm Link  |  Quote  |  Print  |  Notify Moderator

That's confusing. You said if the engine is running and if it is, the alternator should be suppling the power for the levelers. The alternator should be able to supply all the power needed.
To answer your question...yes you can use the boost switch with the engine running.


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gb76087

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Posted: 03/27/21 07:22pm Link  |  Quote  |  Print  |  Notify Moderator

From experience, if the battery is not up to snuff, the jacks can go into error mode. Theoretically I agree with you, but not what I've experienced.

Flute Man

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Posted: 03/27/21 08:04pm Link  |  Quote  |  Print  |  Notify Moderator

Short answer is yes you can.


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RLS7201

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Posted: 03/27/21 08:27pm Link  |  Quote  |  Print  |  Notify Moderator

Yes.

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DrewE

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Posted: 03/27/21 08:49pm Link  |  Quote  |  Print  |  Notify Moderator

I agree with everyone--yes, it is okay to do that.

However, there's a pretty good chance that pressing the button isn't actually doing anything with the engine running, since a very common setup is to use the aux start solenoid as the battery combiner/isolator relay and have it engaged whenever the engine is running.





Bruce Brown

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Posted: 03/28/21 08:51am Link  |  Quote  |  Print  |  Notify Moderator

chuckftboy wrote:

That's confusing. You said if the engine is running and if it is, the alternator should be suppling the power for the levelers. The alternator should be able to supply all the power needed.
To answer your question...yes you can use the boost switch with the engine running.


This. When our jacks show low voltage all I need to do is start the MH and it's good to go.


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theoldwizard1

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Posted: 03/28/21 09:55am Link  |  Quote  |  Print  |  Notify Moderator

chuckftboy wrote:

That's confusing. You said if the engine is running and if it is, the alternator should be suppling the power for the levelers. The alternator should be able to supply all the power needed.

Concur ! At worst, hold the engine at high idle.

wa8yxm

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Posted: 03/28/21 04:35pm Link  |  Quote  |  Print  |  Notify Moderator

On my rig the Power gear system wanted ENGINE RUNNING. And this not only meant the alternator was pushing more amps but the two banks were joined by the Isolator. Sadly it still failed.. Happily it's not may problem any more.


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dougrainer

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Posted: 03/29/21 08:53am Link  |  Quote  |  Print  |  Notify Moderator

chuckftboy wrote:

That's confusing. You said if the engine is running and if it is, the alternator should be suppling the power for the levelers. The alternator should be able to supply all the power needed.
To answer your question...yes you can use the boost switch with the engine running.


Absolutely wrong. Alternators cannot give the AMPERAGE needed to run heavy duty appliances like a 12 volt Jack system or a hydraulic jack system pump. That is why the jack system makers will state to have a GOOD fully charged 12 volt battery in the system.
YES, on the Aux Start. BUT when the engine is running, the AUX start solenoid is already engaged, so you do not have to hold the Aux button. Be advised that some AUX start systems require up to 5 minutes after the Engine is running to engage automatically. If so, you can then push the AUX start button to get immediate coach power to the Chassis system instead of waiting that 5 minutes. Doug

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