Testing a Battery Isolator Controller
I had a problem last week in "Q" where during the drive from Los Angeles to "Q", my coach batteries did not charge from the alternator. I pulled out the trusty cheepy, cra!!y HFT DMM and hooked it up...
Forum Discussion
My BLUE SEA SI-ACR relay here is under control of the Truck Alternator system. This ACR RELAY only connects the AUX battery whenever the truck battery is being charged.
Mine has a trip voltage setting which is set to 14.2VDC.
I see the same thing when I first start up the ACR relay (SOLENOID) engages and connects both batteries together. Then as soon as the truck start battery reaches full charge then it shuts off the ACR RELAY.
The Truck Battery being so close to the truck alternator I suspect it very seldoms stays in BOOST charge very long.
Don't know if your smart solenoid does this same procedure or not.
I think my setup has a manual control to force it into BOOST charge... With the AUX battery so far away from the alternator in my setup it may not ever even recognize it at all... It will always read the truck start battery DC Voltage...
Check on google how the BLUE SEA SI-ACR charge setup works - they have some good info pages on that... Perhaps this will give some clues what to do on your charge setup...
Roy Ken
Mine has a trip voltage setting which is set to 14.2VDC.
I see the same thing when I first start up the ACR relay (SOLENOID) engages and connects both batteries together. Then as soon as the truck start battery reaches full charge then it shuts off the ACR RELAY.
The Truck Battery being so close to the truck alternator I suspect it very seldoms stays in BOOST charge very long.
Don't know if your smart solenoid does this same procedure or not.
I think my setup has a manual control to force it into BOOST charge... With the AUX battery so far away from the alternator in my setup it may not ever even recognize it at all... It will always read the truck start battery DC Voltage...
Check on google how the BLUE SEA SI-ACR charge setup works - they have some good info pages on that... Perhaps this will give some clues what to do on your charge setup...
Roy Ken
