Question about Rv Motorhome Dual Co & Lp Gas Alarm Detector

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I need a wiring diagram for a alternator/battery isolator

My alternator isn't charging my starting battery in my 87 Bounder RV. I replaced the alternator, although it checked good, because the bearing was making noise. That didn't fix the problem. I'm not sure how the alternator connects to the battery through my Transpo 2-130A Battery Isolator or how much voltage should be present on my battery with the car running. It's only 12 volts, so I know that it won't get any charging, and I'm wondering if the battery isolator could be that problem. Should I be getting somewhere around 14 volts out of the isolator going to the battery? Any help would be appreciated...

And Carol, I'm not exactly sure what you're asking, but I just replaced my alternator and the belt was pretty self-explanatory. What problem are you having?


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  • y2jconley Jul 01, 2009

    Thanks for the help. All batteries are brand new but the engine battery ran down on a 30 mile trip. I pulled it and had it checked and charged. I'm only reading 12.3 volts, or so, at the battery with the motor running. I pulled the alternator and had it checked and it checked good - 14 volts. I replaced it anyway because the bearing was making a little noise. I suspect that I must have a bad isolator but am not really sure how it's wired and how I should check it. One cable goes to the + side of the marine battery and one goes to the engine battery. Those should check 14 volts, or so, from the ground side of the batteries. Yes?



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I have a pop up trailer and would like to go camping self contained. This means that I need to hook up the battery to the trailer. I don't know how to get a wiring diagram for this job. How do you hook it up. I need to run lights and furnance fan. The trailer is a Rockwood bought it brand new in 1997

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The isolator should have from 12v-14.3v to the batt. Check the battery itself. If it's a marine battery check the cells for white chalky powder (signs of an internal short in the battery) Also check the distilled water level in the battery. Hope this helps. If you still have an issue, post a comment and I can help you troubleshoot further

Posted on Jul 01, 2009


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2. Charge battery overnight at 1-2 amps you need 12.5 volts or better after charging.
3. Hook up battery positive cable, then with your multimeter on the milliamp scale connect one lead to the negative battery post and the other lead to the ground cable. Meter should read 3 milliamps or less, 10 milliamps with a radio, 15 milliamps with radio and CB. If your meter reads higher you need to isolate the circuit by pulling fuses and circuit breakers one at a time and observe meter for drop in aprerage then get out your test light and track down the short in that circuit.
3. Make sure all connections are clean and tight especially the negative cable at both ends.
4. Hook up volt meter to battery and start engine, if meter falls below 9.5 v while cranking replace battery.
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7. To test voltage regulator go to:
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace stator.
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