Community Forums

dkittle40165 · 01-21-2021, 05:43 PM

I have an issue with chassis batteries not charging when on shore power.

2003 Fleetwood Excursion 39L 3126 CAT

BCC F73-1040 Diesel

Should these batteries charge automatically when house batteries are at 13.6 V?

How do you know if the Trombetta solenoid is bad.

I know the newer version of this BCC (F73-1044) has a BIRD (Bidirectional Isolator Relay Delay) built in.

I may call Fleetwood for help.

Thanks

shootist · 01-21-2021, 08:51 PM

Check the voltage on both sides of the relay. If the inverter is charging the house side the chassis side should be the same. Check the engagement terminal for power or jump 12v to it if you think it's not engaged. Contacts go bad all the time, relay engages, nothing passes through. Blue seas makes better stuff.

dkittle40165 · 01-21-2021, 09:11 PM

Thanks

One side of relay is the chassis battery voltage 12.6, the other side of the relay is the house battery voltage 13.6 when on shore power.

I think the trombetta solenoid is used for an auxiliary start (uses house batteries to start motor) I don’t know if the relay is good.

Does a control board in the BCC automatically energize the solenoid, charging the chassis batteries when house batteries reach 13.5 volts?

The Auxillary start fuse, 3 amp was blown.

I bought the RV in 2018, don’t know if the chassis batteries ever charged off shore power. I don’t know if the Auxiliary start ever worked.

twinboat · 01-22-2021, 05:16 AM

Check for power to one of the small terminals of the trombretta while the inverter/charger is running.

Next, check for power on one small terminal, with the engine running and shore power off.

If you find power to the trombretta small terminal in both cases, you have bi-directional charging and a bad solenoid.

If you only find power with the engine running or holding the boost switch, you have one way charging.

Let us know what you find.

dc.bender · 02-08-2023, 08:39 PM

Greetings,

Working on similar issue on my 2009 Fleetwood 40G.

Currently the batteries are not charging, we have a new TROMBETTA 114-121-020-02 solenoid ready to install.

There is not 100 % power in in the living quarters when the rig is on shore power.

When running , motor, we have 100% power through out quarters.

Currently the solenoid is not getting power, i think. Hooked it up to an independent 12 v source and it clicks w/o issue (assuming the 2 lower hex bolt locations are the input).

I've checked fuses on the F73-1044 battery controller https://rvcustomproducts.com/f73-1044 and they are good.

My question, i think , is what is preventing the solenoid from engaging, and do the batteries need to be at full charge for the shore power to work.

The Batteries are not getting charged from the shore power, when we crank her up, they do get charged, and we can engage the converter, and converter stays active only as long as the batteries have have some charge.

What else should I be looking at?

A million thank yous in advance.

Dave

153stars · 02-09-2023, 03:17 AM

Sounds like you have an issue with inverter/charger or convertor if no inverter installed. Check the inverter push button circuit breakers. Bad fuse or battery connection .
EDIT I missed it has BCC isn't there a solenoid internal to that unit. Sorry I don't know the unit that well. Do they have a troubleshooting page do it
.

Quote:

Originally Posted by dc.bender

Greetings,

Working on similar issue on my 2009 Fleetwood 40G.

Currently the batteries are not charging, we have a new TROMBETTA 114-121-020-02 solenoid ready to install.

There is not 100 % power in in the living quarters when the rig is on shore power.

When running , motor, we have 100% power through out quarters.

Currently the solenoid is not getting power, i think. Hooked it up to an independent 12 v source and it clicks w/o issue (assuming the 2 lower hex bolt locations are the input).

I've checked fuses on the F73-1044 battery controller https://rvcustomproducts.com/f73-1044 and they are good.

My question, i think , is what is preventing the solenoid from engaging, and do the batteries need to be at full charge for the shore power to work.

The Batteries are not getting charged from the shore power, when we crank her up, they do get charged, and we can engage the converter, and converter stays active only as long as the batteries have have some charge.

What else should I be looking at?

A million thank yous in advance.

Dave

dc.bender · 02-09-2023, 07:14 PM

Thanks, have been reviewing the other threads relating to this issue. We’re going to do a deep dive on it this weekend, going to check all the usual suspects, as you mentioned, hoping it’s not a bad board in the Batteries controller. Right now I know the solenoid is not getting turned on. Solenoid is controlled (turned on) by the battery controller, after we diagnosis the usual suspects going to try and track the how this is activated (solenoid) . what I cant wrap my head around is if I am on shore power, why are the batteries involved, I know their not getting charged, but would think (I know I shouldn’t) shore power would handle the cab quarters. Thanks again, I may post on another thread that is related, and will keep this post updated. Dave

dkittle40165 · 02-10-2023, 04:35 AM

I was the originator of this post.

I replaced the Trombetta Solenoid and it solved my chassis battery charging issue.

The solenoid looked fine, but for some reason
wouldn’t work.

There is a trouble shooting guide at
rv custom products.

Good luck

dc.bender · 02-11-2023, 05:02 AM

Thanks dkittle40165

Gary RVRoamer · 02-12-2023, 11:12 AM

Note that the RV Custom Products charge controller monitors the voltage (charge level) in both battery banks and engages the charging relay only as needed. The voltage threshold varies with the spec level of the RVP board and gas vs diesel models, but generally 12.6v in later models and 12.2v in earlier ones.

Iceclimber · 02-12-2023, 02:11 PM

https://www.amazon.com/LITTON-Batter...2-d605505c9d1e

It was pointed out this is only 140 amps and in boost mode the draw could easily exceed 140. However I am not worried because I have a set of jumper cables sitting in the compartment. This device has worked flawlessly for me. If fact I was just doing the water chore and tested it with an external charger...since I can't see it while driving lol.