Ummm, they test the alternator attached to the vehicle with the vehicle running. Takes about 30 seconds. They have a 500 amp carbon pile tester that checks the batteries and alternator at once. Or at least sequentially. What you are describing is more diagnosing the problem. What I am suggesting is merely testing good/bad.
No need to test the batteries, it takes over two hours to get the alternator out to have it tested so I want to make sure it needs replacing before I yank it.
Bobbo wrote: Check the chassis battery and alternator. I had a similar episode in a car once. The alternator had died so the spark plugs were getting their power from the battery. When the battery ran down, the engine died.
This advice still holds. Take it to an auto parts store. They will test the batteries/alternator for free.
Bobbo and Lin 2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6 2017 Airstream Flying Cloud 23FB
Wellโฆ.I changed both the house and engine batteries and now the engine will start without pushing the auxiliary switch. So Iโm thinking I had a bad connection at the engine battery and lost power so just the alternator was giving power then I beeped my large horns when driving everything shut off.
I think I need a new alternator now?
Test New Battery voltage 12.51V -------------------------------------------------- Engine on 14.00V After 20 seconds I hear a click then 13.40 V -------------------------------------------------- Engine on Lights and fans on 12.84V
After you do the simple things like cleaning the battery connections and grounds. If that does not fix the problem, I would then check your alternator output on the large red wire on the alternator. Is it putting out 14+ volts? Then check the chassis is 13+ volts getting to the chassis battery? You probably have 2 mechanical solenoids on the firewall somewhere. I would check the large posts to see it 12+ volts can be read without pushing the aux start button. If you have no power on the dash board after cleaning the connections, and your alternators is good I would suspect the one of the solenoids.
My main and aux battery disconnect goes to my battery control center under the hood. The BCC controls ignition and charging both batteries .If you search the web you you can get a wiring diagram and troubleshooting guide. My disconnect switch's and ignition relay are inside the box. When you push the aux battery sw you jumper both sets of batteys together.
2016 Winnebago 35B v10 2006 Jeep Liberty 4x4 Blue ox Tow Bar
uwireme wrote: I have four-6 volt batteries and one 12 volt
I read a little over 12 volts for both sets
Does someone have a wiring diagram to wire the 4-6 volt batteries for the house and the 12 volt for the engine?
Your problem has nothing to do with the House and house batteries. Your problem is, you have LOST 12 volt power to the engine/controls from the chassis battery. The alternator at this point has nothing to do with your problem. When you engage the AUX start switch you are supplying the Chassis engine/system with 12 volts. FIND where you have lost your chassis power. Having 12 volts on the chassis battery is good but not useful here. You have 12 volts, but that power is NOT connected somewhere to the chassis system. Either the Ground/negative wire is off or your 12 volt positive cable is not connected. due to the age of rv, trace the negative cable from the battery to the frame/engine mount point. It may have rusted and broken off. Do you have ANY dash systems that function? Once you have found the chassis battery problem and engine runs from the chassis battery, then check the Alternator output. Doug
Bad alternator or battery. If the engine continues to run after immediately releasing the aux start button, the battery is bad. If it dies, then the alternator is bad and possibly the battery.
Check the chassis battery and alternator. I had a similar episode in a car once. The alternator had died so the spark plugs were getting their power from the battery. When the battery ran down, the engine died.
Bobbo and Lin 2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6 2017 Airstream Flying Cloud 23FB
uwireme wrote: the house battery disconnect switch above front door does not work.
Is this issue a "new" issue, as in one that just started when the engine quit or one that's been there for awhile?..:h...Dennis
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