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Old 01-26-2018, 05:25 PM   #1
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Battery boost fail

Woke up to low batteries and cranked the engine. Hit boost switch to crank generator and nothing.Let engine run for a while and it never kicked over to charge the house batteries. When the engine is off, I can hit the boost switch and hear a click under the hood but it still won't crank the generator.
Where should I start looking? Could this be a bad solenoid?
Unit is a 2009 Canyon Star 3920.Please help!
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Old 01-26-2018, 05:36 PM   #2
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On my coach the boost and engine charging are done by the same solenoid. The solenoid was recently bad with the same symptoms you describe - neither boost nor engine charging working even though one could hear the solenoid engaging.

If you put a meter on the solenoid at each battery terminal you should read the differing battery bank voltages. The coil should of course show voltage when the boost switch is engaged. And when engaging boost the battery terminals voltages go to be the same - If not, likely bad solenoid.
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Old 01-26-2018, 07:29 PM   #3
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If your in a bind, hit the boost switch a bunch of times or tap on the solenoid while holding the switch. It may make a connection and get you going.

You can also carefully jump 1 big terminal to the other with jumper cables.
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Old 01-26-2018, 08:18 PM   #4
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Quote:
Originally Posted by twinboat View Post
If your in a bind, hit the boost switch a bunch of times or tap on the solenoid while holding the switch. It may make a connection and get you going.

You can also carefully jump 1 big terminal to the other with jumper cables.
Agree. You can also move both battery wires to the same large terminal as a workaround.
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Old 01-26-2018, 10:13 PM   #5
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Quote:
Originally Posted by rtd8 View Post
Woke up to low batteries and cranked the engine. Hit boost switch to crank generator and nothing.Let engine run for a while and it never kicked over to charge the house batteries. When the engine is off, I can hit the boost switch and hear a click under the hood but it still won't crank the generator.
Where should I start looking? Could this be a bad solenoid?
Unit is a 2009 Canyon Star 3920.Please help!
You should look in QT's #3 and PROBLEM SOLVERS and you will find this thread.
The boost switch is to get your coach started if your chassis battery is dead or weak not the other way around. Gen starts from your house batteries in a gas coach.
If coach is plugged in your battery cut off switch should always be on when using your coach.
If you have AGS for Gen to charge batteries may need to be programed correctly.
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Old 01-27-2018, 04:51 AM   #6
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Quote:
Originally Posted by 007";4009650]You should look in [B][URL="http://www.irv2.com/forums/f103/newmar-quick-tips-and-easy-mods-3-a-113631.html
QT's #3[/URL][/B] and PROBLEM SOLVERS and you will find this thread.
The boost switch is to get your coach started if your chassis battery is dead or weak not the other way around. Gen starts from your house batteries in a gas coach.
If coach is plugged in your battery cut off switch should always be on when using your coach.
If you have AGS for Gen to charge batteries may need to be programed correctly.
You certainly can use the boost switch to assist your discharged house battery in starting your generator.

While boondocking, the house battery is the one that will need a boost.

The OP is dry camping, plugging in isn't an option.
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Old 01-27-2018, 04:57 AM   #7
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Find that clunker, then you can measure the voltage one each large post as someone hold the boost button. The voltage should be the same on each side.

If it is not, replace it. If it is then you have a bad connection along that path.

In a pinch, use one jumper cable from the house positive to the chassis positive. Be very CAREFUL the area is ventilated. One spark can cause a dangerous disaster.
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Old 01-27-2018, 05:29 AM   #8
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You need either a volt meter or a trest light, and start following the wire from battery to generator. BRIGHT GOOD Dim/dark bad.
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Old 01-27-2018, 08:05 AM   #9
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With solenoid “boost” engaged you can also measure the resistance across both big lugs which should be near 0 ohms. If it’s higher than 3-5 ish ohms then contacts might need cleaning as another cheap fix.
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Old 01-27-2018, 09:05 AM   #10
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You certainly can use the boost switch to assist your discharged house battery in starting your generator.

While boondocking, the house battery is the one that will need a boost.

The OP is dry camping, plugging in isn't an option.
True for my Tiffin. The aux / boost function is used bidirectionally to start either genny from chassis batt (the dry camping scenario (did it just this morning)) or engine from house batt.
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Old 01-29-2018, 03:13 PM   #11
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I would think the solenoid is controlled from house or chassis batteries but not both. It could be from the dead batteries which is why it is not working.
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Old 01-29-2018, 04:57 PM   #12
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Quote:
Originally Posted by twinboat View Post
You certainly can use the boost switch to assist your discharged house battery in starting your generator.

While boondocking, the house battery is the one that will need a boost.

The OP is dry camping, plugging in isn't an option.
You have said this before explain to me and others how does the coach chassis battery supply voltage to GEN when the operation of solenoid relay only shows the 12v coming from the house batteries for operation of solenoid.
If the house batteries are dead there is no voltage to operate the solenoid and the chassis battery does not have a connection to the boost switch to operate the solenoid..
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Old 01-29-2018, 05:01 PM   #13
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I would think the solenoid is controlled from house or chassis batteries but not both. It could be from the dead batteries which is why it is not working.
You tipped me off to the previous post question , thank you.
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Old 01-29-2018, 05:22 PM   #14
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If your boost solenoid is powered from the house battery as most are, starting the engine lets the engine alternator put some charge into the house batteries. Give things a few minutes and the house will get enough charge from the alternator to toggle the boost solenoid then that will supply a current hit like jumper cables. Usually enough to start the generator.
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