![]() ![]() Upon disconnection from all charging, the batteries should show 12.6v to 12.7v. As the batteries become charged, the invertor will switch to absorption charging showing a reduced voltage, and finally switch to float charging where the batteries should show 13.1v to 13.4v on the charge-status equipment. The inverter will go through three stages of charging - bulk, absorption and float - starting with bulk charging showing over 14v on the charge-status equipment. BIG BOY BATTERY ISOLATOR RELAY MAKING NOISE GENERATORWhen stopped traveling and after plugging into shore power or with the generator running, the inverter will, after a time, charge and maintain the coach and chassis batteries to 13.1v to 13.4v. Fully charged and while stopped at a rest area, for example, the chassis batteries should show 12.6-12.7v without being plugged into shore power, without the generator running, and without the coach engine running. But you are correct, after a few hours of leaving MI, the chassis batteries should have been showing fully charged during the whole trip from MI to Laredo. I don't know the length of time elapsed between these two posts. In Tim's second post: "We just drove from Mi the Laredo so the chassie batteries should be fully charged." In Tim's first post: "The chassie batteries are 12.4 I'm hooked to a 50 amp service." The set up is like this Positive wire hooked up from starter battery > switch->isolator->home batteries-> etc. I realize you were concerned about the noise, and you should be able to hear the big boy cycle, but the louder it becomes the more likely you have a good corrosion build up inside the Big Boy. ![]() The ground wire on the BIRD was being temperamental. Once i fixed that all operation was normal. forums/f15/front-slideout-track-makes-awful-noise-when-driving-92683.html. I did have a case where the house batteries were not being charged while driving and found my BIRD to be malfunctioning. .com/forums/f15/wurth-elektronik-battery-isolator-issue-73191.html 0.5969. When ignition is on and engine running, then Chassis batteries have priority and if house batteries drop to a certain voltage the big boy will close charging both battery banks. When on shore power the House batteries have priority and when the Chasis batteries drop below a certain voltage the big boy will close and charge both banks. The key was the voltage required to get the BIRD to engage the Big boy solenoid so house and chassis batteries. I first ran into it on American coach products and then Monaco products. Also it is normal for the big boy to cycle between battery banks. That era BIRD and Big boy were first generation and there was a situation that developed as the batteries aged or were neglected. Once I cleaned mine the noise from the Big Boy was much less. Thats assuming you have a corrosion build up. Disassembly and cleaning should bring it back to normal operation. ![]() Big Boy will make more noise as the corrosion on the inside becomes greater. ![]()
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