![]() So find out if and or why your charging system does not appear to be working and then move from there to the isolator and batteries. It sounds like maybe the PO wired everything up at the Isolator Batt terminal, which isn't bad, but I would have done it at the Starter solenoid or battery. So your system is probably wired by the Alt Batt terminal wire going into the cab through the gauge and then back to the terminal on the isolator. In order for an Alt Gauge to work the load has to travel through it. And the Primary Batt is used just for starting. Or it could be where all your loads are, like lighting, radio, etc. The Aux Batt would be completely separate from you system and loads, so that you have a reserve to start you up. ![]() 3 terminals would be Batt main, Alt output and Batt Aux. The isolator keeps the batteries separate when the vehicle is not running. If that is so then you are just running off the batteries, draining them until the voltage will not keep the vehicle running. If you are only seeing 12v and 12v at the battery then what you are seeing is battery voltage. With the vehicle running you should see something like 14v - 14.2 from the charging system. I will provide pics later today or tomorrow. Is it good logic to check the voltage between Terminal A at the isolator and ground? Will that tell me if the alternator is putting out the correct voltage? Or, do I need to do something to take the voltage regulator out of the circuit? So, I'm trying to understand how to determine if the charging problem is the alternator or the voltage regulator. I would like to solve the charging problem this weekend, though. Rewiring under the hood was something I planned on doing in the next month. It looks sloppy with everything stacked on the same terminal but, I guess it really isn't any different than having the wires connected at the battery terminal. I believe that the terminations that have yet to be identified from Terminal 1 are for the two sets of lights, and possibly an amplifier. ![]() it has six wires attached to it (two to the voltage regulator, one to the main battery, and the other three have not been traced out yet). Terminal 2 has one wire which goes to the auxiliary battery. Terminal A has two wires terminated there, one which is from the alternator and the other which appears to the go to the ammeter in the cab of the Bronco. There are three terminals on the isolator. ![]() One of the previous owners installed a Sure Power Model 9523A Multi Battery Isolator. The auxiliary battery is 8V with the Bronco not running, and 8V with it running.īased on the reading at the batteries running versus non-running, it sounds like a charging problem. The voltage on the primary battery is 12V with the Bronco not running, and 12V with it running. I am thinking that the auxiliary might not be charged enough but, troubleshooting that setup will be a few steps down the road.) With the motor running the ammeter is reading 0. (Or maybe I should say that the primary battery does. I charged both (possibly one is bad) but, they have enough power to start the Bronco. The problem is that both batteries in our '71 discharged. I have done some searching but, I am not coming up with anything specific, so I thought I would present some basic facts, and see if anyone can point me in the right direction. ![]()
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