oynex Report post Posted September 17, 2016 I HAVE A 2004 ITASCA HOIZON 40KD AND I'M INTERESTED TO KNOW HOW THE COACH BATTERIES CHARGE WHEN I UNPLUG FROM SHORE POWER. I WAS TOLD MAYBE A RELAY OF SOME KIND THAT DOES THAT BUT NOT SURE WHERE IT IS LOCATED OR HOW IT WORKS. I'VE LOOKED AT THE WIRING DIAGRAMS I GOT FROM WINNABEGO AND DO NOT SEE ANYTHING OTHER THAN THE GENERATOR RUNNING THE BATTERY CHARGER ARE THESE BATTERIES CHARGED WHILE UNDER WAY? THANKS, BOB Share this post Link to post Share on other sites
hermanmullins Report post Posted September 17, 2016 Bob, do you have an inverter/charger. If unsure, contact the mfg. They can tell you what kind you have. Just a side note, all Capitols indicates you are shouting. Herman Share this post Link to post Share on other sites
oynex Report post Posted September 17, 2016 Sorry about the caps. Lock was on. Yes I have an inverter/charger and have checked the charging of it while plugged in and it will go from 55 amp to float with no problem. Share this post Link to post Share on other sites
wolfe10 Report post Posted September 17, 2016 The converter or inverter/charger ALWAYS charges the house battery bank. SOMETIMES the coach maker installs a device (several different kinds) that also charge the chassis battery from shore power or generator. You need to check with your coach maker to verify how yours is set up. We can also give you easy instructions on how to verify this with a digital voltmeter. The alternator charges both battery banks in all RV's I have ever worked on. Share this post Link to post Share on other sites
ClayL Report post Posted September 17, 2016 If by coach batteries you are taking about the house batteries rather than the engine batteries, then yes they are charged by the alternator while the engine is running, There is a solenoid that is activated in two ways. 1) By a wire connected to the RUN terminal on the ignition switch. 2) By the momentary rocker switch on the dash that connects the engine battery to the house batteries. It is used to start the engine when the engine battery is discharged. There is another solenoid that is used to disconnect the house batteries from the house dc system. It is activated by a momentary center off rocker switch usually located in the step well. Both solenoids are usually located close to each other. Often in a compartment behind a panel on one of the steps. Sometimes in a box on the left sidewall above the propane tank . As an aside, I think in 2005 Winnebago started installing a Trickle Start charger that charges the engine battery by the converter/shore power. This keeps the engine battery from discharging when you are connected to shore power so the engine battery won't be discharged by parasitic/keep alive drains. See https://www.bing.com/search?q=trickle+start+battery+charger&qs=AS&pq=trickle+start&sk=AS2SC3&sc=8-13&sp=6&cvid=2C3934AD94BB4BB7933F422A6A541FE1&FORM=CHRDEF I used a BatteryMinder Plus float charger on my coach instead. See http://www.batteryminders.com/12-volt-maintenance-charger-desfulator-1500 Here is the Winnebago diagram showing the two solenoids, i Share this post Link to post Share on other sites
five Report post Posted September 17, 2016 Some of the information above is not pertinent for all coaches, thus not correct for the OP and others. It seems all manufacturers have a different method of charging batteries. I've posted this before, but for clarification, I'll do it again...this is how my batteries are charged...or not charged:- When plugged into shore power. Coach batteries are charged. When that charge reaches 13.3, the coach batteries let the charge pass through and the chassis batteries are charged as long as that charge rate is 13.3 or higher.- When driving. Chassis batteries are charged. When that charge reaches 13.3, the chassis batteries let the charge pass through to the coach batteries and they are charged as long as the charge rate is 13.3 or higher.It might not make sense, but that's how it works. Share this post Link to post Share on other sites
wolfe10 Report post Posted September 17, 2016 43 minutes ago, FIVE said: Some of the information above is not pertinent for all coaches, thus not correct for the OP and others. It seems all manufacturers have a different method of charging batteries. I've posted this before, but for clarification, I'll do it again...this is how my batteries are charged...or not charged:- When plugged into shore power. Coach batteries are charged. When that charge reaches 13.3, the coach batteries let the charge pass through and the chassis batteries are charged as long as that charge rate is 13.3 or higher.- When driving. Chassis batteries are charged. When that charge reaches 13.3, the chassis batteries let the charge pass through to the coach batteries and they are charged as long as the charge rate is 13.3 or higher.It might not make sense, but that's how it works. Yup, one of the several good ways to do it. But as you said, there are a NUMBER of ways it could be done (or not done). Winnebago should be his next call or look it up in his owners manual. Share this post Link to post Share on other sites
BillAdams Report post Posted September 17, 2016 6 hours ago, oynex said: I HAVE A 2004 ITASCA HOIZON 40KD AND I'M INTERESTED TO KNOW HOW THE COACH BATTERIES CHARGE WHEN I UNPLUG FROM SHORE POWER. I WAS TOLD MAYBE A RELAY OF SOME KIND THAT DOES THAT BUT NOT SURE WHERE IT IS LOCATED OR HOW IT WORKS. I'VE LOOKED AT THE WIRING DIAGRAMS I GOT FROM WINNABEGO AND DO NOT SEE ANYTHING OTHER THAN THE GENERATOR RUNNING THE BATTERY CHARGER ARE THESE BATTERIES CHARGED WHILE UNDER WAY? THANKS, BOB They "should be"! This is done using the engine alternator. You should have a battery isolator in the loop somewhere that will send voltage to the batteries while driving and from the inverter/charger while parked. It's easy to check. With the engine off, check the battery voltage. It should be in the 12.5V (ish) range. Now, start your engine and check the battery voltage again. It should now be in the 13+V range. If so, the engine is charging your batteries. Share this post Link to post Share on other sites
Lenp Report post Posted September 18, 2016 My coach has a BIRD relay installed from the factory that will charge BOTH battery banks from any source. As I understand it, the BIRD monitors the voltage on both banks and if/when one gets to a voltage somewhat higher than the other charging voltage/current will pass the second bank bringing it up to the same level as the first. See http://www.discoveryowners.com/bird.pdf Lenp Share this post Link to post Share on other sites
manholt Report post Posted September 18, 2016 My 07' Tour 40' KD, had also a solar plate that charged the engine batteries (2) while parked. Never could figure out if it worked or was by passed when traveling. All I discovered was that the chassis was an 05' and coach was built in 06'...my relays was under step and my HWH motherboard was under step as well...crowded! Carl Share this post Link to post Share on other sites
RodgerS Report post Posted September 18, 2016 Your MH has three electrical systems that work together - something worth taking some time to research. RodgerS. Share this post Link to post Share on other sites
wolfe10 Report post Posted September 18, 2016 Actually always 3, many times 4 or 5 and this is just the "12 VDC side of things". You also have a 120 VAC system. The two overlap in the converter, inverter and/or inverter charger: All have: Alternator charges both house and chassis batteries. Converter, charger or inverter/charger charges house bank and SOMETIMES chassis bank Many have in addition: Supplemental system for charging the chassis battery-- could be stand alone smart charger (small amp output) or "smart thief" device that takes power from the house bank to charge the chassis bank when house bank is above a certain voltage. Solar panel and (hopefully) smart controller can be wired to charge either or both banks. Share this post Link to post Share on other sites
kaypsmith Report post Posted September 20, 2016 Yes, you can add a 24 volt chassis system to the list on some, mine has this, and Bill Adams most likely has one. Share this post Link to post Share on other sites
BillAdams Report post Posted September 20, 2016 Yep, 12V house batteries, separate 12V generator battery and 24V engine starting batteries. 2 separate alternators to charge the house and engine batteries while driving but only the house batteries are charged when parked. I have a separate portable 24V charger to top off the engine batteries if I will be parked somewhere for more than a couple of weeks. Share this post Link to post Share on other sites
oynex Report post Posted September 24, 2016 Thanks for all the info. I finally located a solenoid in behind a panel in the electrical compartment. I tested it and it does not work. New one exact replacement on order from MurCaL Inc. The solenoid is active when the ignition is on. This will charge my house batteries while driving which was the problem off getting somewhere and the batteries were weak. Share this post Link to post Share on other sites
desertdeals69 Report post Posted September 24, 2016 3 hours ago, oynex said: Thanks for all the info. I finally located a solenoid in behind a panel in the electrical compartment. I tested it and it does not work. New one exact replacement on order from MurCaL Inc. The solenoid is active when the ignition is on. This will charge my house batteries while driving which was the problem off getting somewhere and the batteries were weak. Make sure it is a continuous duty solenoid. Share this post Link to post Share on other sites
hermanmullins Report post Posted September 24, 2016 It is a #55 solenoid can get them at O'Reilly's, Auto Zone and NAPA as stated, 12 volt continuous. Looks just like the momentary but isn't the same. Herman Share this post Link to post Share on other sites
manholt Report post Posted September 25, 2016 Take a look at Volta Power System! Carl Share this post Link to post Share on other sites
abyrd Report post Posted September 25, 2016 Blue Sea offers several automatic auto charging relays (ACR) that are popular in the marine industry. I have two of them on my boat and they have been in service for over eight years and have performed flawlessly. They allow for the batteries to be tied together if either system is above 12.8 volts. I believe the switching is done with an electronic device, not a electrical/mechanical solenoid. Blue Sea has an excellent web site with electrical schematics. Jim Share this post Link to post Share on other sites
artgray Report post Posted September 25, 2016 I have a 2003 Safari Panther. The house batteries as well as chassis batteries are supposed to be charged depending on which bank needs charging, while on the road. Yet, when hooked up after driving, the Trace Inverter says that the house batteries are now being charged. How do I check, to see if the "brain" is working while on the road. I would guess that after driving for 6 hours, all banks would be charged at the end of the day. Art Gray Share this post Link to post Share on other sites
wolfe10 Report post Posted September 25, 2016 Art, Welcome to the FMCA Forum. A digital voltmeter (they start under $20) will tell you very quickly. Measure voltage on each bank before starting the engine (shore power disconnected, generator off). Start engine and increase to 1,000 RPM. Re-measure voltage at each battery bank. Share this post Link to post Share on other sites
artgray Report post Posted September 25, 2016 Brett, thank you very much. Good to hear from you. I assume that you and your Bride are still on the road. Art Share this post Link to post Share on other sites
wolfe10 Report post Posted September 25, 2016 Art, Actually, we are back home. Back on the road after the first of the year-- headed to AZ to present Maintenance Seminars for the Diesel RV Club Rally in Goodyear AZ February 26- March 3. 2017: http://www.dieselrvclub.org/event-2316575 Then on to the FMCA Convention to present more seminars in Chandler. Share this post Link to post Share on other sites