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Dreamweaver's avatar
Dreamweaver
Explorer
Jul 05, 2016

Help with Electrical

Brand new here, brand new to RV's --- HELP

Recently acquired a 1989 Southwind, P-30. Was well taken care of its whole live. Owned it for 3 weeks and took it to a local shop to have it gone through, change fluids, convert the AC to R34, etc.

It was in the shop for a couple of weeks because of a delay in getting a part for the front end. They dropped it off at my house Later that day I started it up and noticed a strange noise, and electrical surging.. the interior lights, dash lights, headlights, etc. were surging. I took it in the following day, the mechanic opened it up, and diagnosed that the Battery Isolator Controller --- made by Intellitec --- was defective. I was there and watched him test it, and it was definitely the problem.

Took it home, plugged the RV into the outlet to keep the refrigerator running. Today we went to take a short trip for fireworks and it wouldn't start... nothing at all. Not even enough juice to turn anything on in the cab.

I took a battery charger out to see if I could jump start the battery and it gave a reading F02 - "Bad Battery Connection. Battery Voltage Too Low to Accept a Charge".

I have no idea what to do. Everything on this rig worked perfectly when I bought it, and when I played around with it for a couple of weeks in my driveway. As soon as I get it back from this shop I have this issue, and as far as I know they didn't do anything service wise that would have required fooling around with anything electrical except for the AC unit - they had to replace the condenser and some other parts. Aside fro the fact that they said that the replacement condenser they used failed, and had to get another one, I don't know what else they could have done that might have caused a problem.

I can't even get it started to take it in, so I guess I will probably have to have it towed. If you have ANY advice I would certainly appreciate it. Thanks in advance.
  • Don't waste a tow and more shop time. Go buy a new battery. Measure the hole and fill it up with the largest one you can get or afford.

    The battery is the heart of the beast and yours is shot,.
  • wa8yxm's avatar
    wa8yxm
    Explorer III
    The Isolator device might not have been defective....
    If it sat for a while. with old enough batteries the batteries (house) may have been dead (run down dead, as well as past end of life)

    Now many Intelletec Battery Control Systems use a BIRD (BI-Directional Relay) and with this system if the engine is running and the system voltage is high enough the batteries (All of them) charge, else only the engine

    Well when it closes, thus connecting the very low house, the voltage drops and it re-isolates, then the voltage rises and it re-connects (After a delay in all cases) causing the surging you cited.

    Also a breaker can open due to high load and cause it, then self reset, on some RV's. (Mine for example)

    And of course the technician may have installed the new isolator wrong ---OR---

    The converter may have blown a fuse due to dead house batteries or not been able to bring them up to the "Connect" voltage due to the house batteries being toast.
  • Make sure your battery terminals are clean and tight. Take them off, clean them and reattach.

    If the terminals on my 96 Southwind get a little corrosion, even if you can't see it, I have electrical problems and it won't start.
    Check the battery to see if it will take and hold a charge.
  • I doubt that anything is wrong with the Intellitec controller- if the alternator was trying to charge a dead battery, it would cycle, as it disconnects if the voltage drops below ~12.7, then reconnects when the voltage rises. All it does is control the solenoid. and it does that by sensing voltages. I think you just have a bad battery.
  • Never liked those things. These days I think I would use a real contactor relay to charge both batteries and do away with the diode losses
  • Dream-

    Use jumper cables to get it started and then go online and order a replacement Intellitec controller. It probably killed the chassis battery.

    When you do get it started, look for the jump up in battery voltage that says it is charging.

    If it got killed that dead, the main engine battery may be toast.

    Good Luck

    Matt

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