Originally Posted by Scalf77
Once you start the van and the voltage goes above 13.2-13.5V the surepower is activate and you will be charging both batteries. This can be altered by how the start assist circuit is wired up. One way was to wire it to the start circuit of the van, so when they key was turned to start it would activate. It has also been wired to the run circuit, this will also activate the the surepower when the key is in run (Most of the time this would mean you have voltage above13.2 -13.5 volts. You may also see the start assist circuit going to a switch, it may be momentary (preferred). The switch could also activate the surepower. Also because we are talking about the 1315 it is bidirectional so when charging your house batteries (plugged in or solar) if that voltage goes above 13.2 - 13.5 the surepower will engage. The surepower will open when the voltage drops below 12.4-12.9V
hope this helps
Also, if you believe that the surepower is really activating but not charging the house batteries while driving, you may have built up a contact resistance on the solenoid, in that case it would either need to be cleaned or replaced. To check if the surepower is activating you need check the two smaller terminals going to the solenoid. you should see voltage across these two terminals, it will be around 12 volts. You can purchase the solenoid parts by itself.
Checked on a few things and this is what Im finding.
First is upon engine start up there is no charging going to the house battery. If I disconnect the ground wire from it I do hear it disengage and when I plug it back in I hear it engage again. But it still is not giving me current to my house battery.
So thinking that there may be resistance built up in it (dirty parts) I unhooked the ground again but this time I very quickly and many times touch and untouch the terminal with the ground wire to realy rattle the unit. It seems to wake up after that and is giving me a charge once I reconnect the ground. Now the charge it is giving me is in the 13 plus volt range. It is not the same as the other side (incoming from start battery) that side is in the low 14 volt range. I thought I read somewhere that these two sides should be the same or at least very very close.
Ive checked the 4 other metal legs that come from the solinoid to the smart diode section and one seems to be a ground, One gives the same reading as the incoming lug from the start battery, one gives the same as the outgoing lug (house battery) and the last one gives a reading less than the incoming (about 13.07 volts)
Ive got a fresh house battery coming in on Friday, after that I guess I will check further, but it seems to me that I might have a failing 1315-200?
Can the build up resistance that cause these to fail be sped up by the atmosphere the van resides in? Wet enviorment vs. dry? Or is it just something that happens to all?
Thanks again Scalf77