Engine battery not charging on shore power

[Cobra93teal]

I know that is the batt isolator/aux start relay. It works as it should with the aux start button or ignition. Problem I have is the battery I no longer charging on shore power. The house batts are charging, just not engine batt. Is the small red wire in pointing too for the charging circuit? Where is the other end? I can discover that and it’s dead. While connected it reads the same voltage as the engine battery, the other side of that solenoid has the 13.xx volts from the converter charging the house batteries. The battery side only has the 12.xx volts same ass batt/and that small red wire.

 

[Ronald M A]

I don't believe shore power will charge the chassis battery. Over the winter, I put a battery tender on mine.
To my understanding, the onboard converter is just for house battery.

 

[Cobra93teal]

I don't believe shore power will charge the chassis battery. Over the winter, I put a battery tender on mine.
To my understanding, the onboard converter is just for house battery.

I wish I was 100% sure but I have had the Rv for 2 years and never had the engine battery die. When parked it’s always on shore power. I know it’s possible the battery just held it but it sat for months and never died. It’s a 2014 Jayco Greyhawk 34 if anyone else has one to check lol.

 

[Grumpy]

I wish I was 100% sure but I have had the Rv for 2 years and never had the engine battery die. When parked it’s always on shore power. I know it’s possible the battery just held it but it sat for months and never died. It’s a 2014 Jayco Greyhawk 34 if anyone else has one to check lol.

RO is correct. Only the Seneca's have that feature.

 

[Cobra93teal]

RO is correct. Only the Seneca's have that feature.

Well then I have spent 4 hour’s chasing my own ass

 

[Cobra93teal]

Maybe that red wire is for the steps then or something.

 

[RogerR]

When your battery was new it had more long term capacity. Now it the time to get a battery tender since you have the RV plugged it and power is available. I like the Battery Tender Junior and used it for years till I got a lithium house battery instead of lead. I bought a Harbor Freight one for my garden tractor but it was defective and overcharged it. Now it get the Battery Tender Junior.

 

[Grumpy]

Maybe that red wire is for the steps then or something.

Could be the hot feed for your 7 pin..Just a guess been too long. Traded our E-450 in 08.

 

[JimD]

The picture looks like what was originally in my 2017 Greyhawk. It only engages when the ignition or aux start button is engaged. Mine failed so I replaced it with the older style silver solenoid relay which I have previously used with great success. It still works in the same manner. I use a trickle charger on the chassis battery.

If you want to charge both ways you will need to install a bi directional relay.

The wire you are pointing to probably feeds the house battery. The wire is connected to an inline circuit breaker from the relay and then off to the house battery.

 

[Cobra93teal]

When your battery was new it had more long term capacity. Now it the time to get a battery tender since you have the RV plugged it and power is available. I like the Battery Tender Junior and used it for years till I got a lithium house battery instead of lead. I bought a Harbor Freight one for my garden tractor but it was defective and overcharged it. Now it get the Battery Tender Junior.

Yea or maybe I have a new parasitic draw. It should charge it! Easy enough for them to do. The wiring on these things is horrible…. Only been a RV owner for 2 years but everything is junk. Wiring is nasty

 

[Cobra93teal]

The picture looks like what was originally in my 2017 Greyhawk. It only engages when the ignition or aux start button is engaged. Mine failed so I replaced it with the older style silver solenoid relay which I have previously used with great success. It still works in the same manner. I use a trickle charger on the chassis battery.

If you want to charge both ways you will need to install a bi directional relay.

The wire you are pointing to probably feeds the house battery. The wire is connected to an inline circuit breaker from the relay and then off to the house battery.

That red wired has zero power when I disconnect the engine battery. The other side of the solenoid (connected back the the house batteries) has full voltage. So still a mystery. I know it charges the engine battery side only when that solenoid is engaged(alt then charges house when engine runs) seems like it would be easy to trigger that relay when it senses shore power somehow .

 

[cpd1343]

I know that is the batt isolator/aux start relay. It works as it should with the aux start button or ignition. Problem I have is the battery I no longer charging on shore power. The house batts are charging, just not engine batt. Is the small red wire in pointing too for the charging circuit? Where is the other end? I can discover that and it’s dead. While connected it reads the same voltage as the engine battery, the other side of that solenoid has the 13.xx volts from the converter charging the house batteries. The battery side only has the 12.xx volts same ass batt/and that small red wire.

If you want the chassis battery to charge on shore power you will need this: https://www.amazon.com/gp/product/B0016G8RT8/ref=ox_sc_saved_image_2?smid=ATVPDKIKX0DER&psc=1

 

[Cobra93teal]

If you want the chassis battery to charge on shore power you will need this: https://www.amazon.com/gp/product/B0016G8RT8/ref=ox_sc_saved_image_2?smid=ATVPDKIKX0DER&psc=1

Would I be stealing the house side of the solenoid to this then to the engine battery?

 

[cpd1343]

Would I be stealing the house side of the solenoid to this then to the engine battery?

Yes. As long as the coach batteries are receiving a charge, a portion of that goes to the chassis battery.

 

[Cobra93teal]

Yes. As long as the coach batteries are receiving a charge, a portion of that goes to the chassis battery.

Makes sense

 

[Grumpy]

Makes sense

The one Jayco provided on the SENECA's sensed when the chassis battery needed a charge and adjusted accordingly. Does this one do the same thing?

 

[Grumpy]

If you want the chassis battery to charge on shore power you will need this: Amazon.com

Yes. As long as the coach batteries are receiving a charge, a portion of that goes to the chassis battery.

Makes sense

The one Jayco provided on the SENECA's sensed when the chassis battery needed a charge and adjusted accordingly. Does this one do the same thing?

 

[Cobra93teal]

The one Jayco provided on the SENECA's sensed when the chassis battery needed a charge and adjusted accordingly. Does this one do the same thing?

From the looks of it yes, it will look for 13 plus volts on one side then connect them. Drops below that and shuts off. Should keep
From killing on or the other battery.

 

[Grumpy]

From the looks of it yes, it will look for 13 plus volts on one side then connect them. Drops below that and shuts off. Should keep
From killing on or the other battery.

Should cut off if one reaches full charge, not when one side drops.

 

[cpd1343]

Should cut off if one reaches full charge, not when one side drops.

About this item​

• 15 A maximum charge current
• Automatically adjusts for 12 or 24 volt battery banks (both battery banks must be the same DC voltage and battery type)
• Automatically switches on/off without affecting the in-house battery bank or over-charging
• Utilizes excess current from the primary charging source
• Built-in thermal and over-current circuits