Help with wiring diagram setup - Fiberglass RV


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Old 12-15-2009, 01:36 PM   #1
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I'm starting to make my wiring diagram and have a question. I will be putting in a power converter that has a battery charger. When I come from the pig tail connection from the car, do I connect the white and black wires into the converter first and then take them to the battery, or connect them into the battery first with a tie off to the converter. I started thinking (sometimes a problem) that doing it the second way might not charge up the battery correctly. The converter I'm getting is Progressive PD4000. I'm reading the wireing instructions and they just say battery pos and neg locations.
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Old 12-15-2009, 02:35 PM   #2
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I'm starting to make my wiring diagram and have a question. I will be putting in a power converter that has a battery charger. When I come from the pig tail connection from the car, do I connect the white and black wires into the converter first and then take them to the battery, or connect them into the battery first with a tie off to the converter. I started thinking (sometimes a problem) that doing it the second way might not charge up the battery correctly. The converter I'm getting is Progressive PD4000. I'm reading the wireing instructions and they just say battery pos and neg locations.

Consider this: as you no doubt know, the on-board trailer battery is there only to provide power to your internal 12V trailer power demands—cabin lighting, water pump, frig, etc., as needed. NOT the outside running and tail lights. This power is provided by the tow vehicle.

If there was NO converter in the chain, the pigtail harness pos and neg wires dedicated to the trailer battery are directly connected. The tow "reads" the trailer battery as just another demand source. When driving, the alternator provides the juice to keep it peaked, just like the tow vehicle battery. So the short answer is Yes, a direct connection to the battery is okay, even if you have a converter.

However, it is my understanding that (given the right gauge wire is used, and all is properly connected) running your tow vehicle power supply and return wires to your converter first, then back to your trailer battery works exactly the same without any loss. The advantage with this route comes when considering the battery charger component of your converter. As you know, the converter converts 120V AC into 12V DC only when "hooked up" to shore power. (Presumably, this happens only when parked!) The "charger" sends power to your trailer battery as needed—using the same converter-to-battery wire connection described above. No need for a second set or redundant wires.

The one hiccup I ran into (and has been discussed here on the forum) is keeping the trailer "isolated" from the tow when parked, but still connected via the harness. With the engine shut down, and under certain circumstances, the tow could drain the trailer battery and/or vice versa. In my case, a solenoid-like gizmo (Help me out here, folks!) was installed in my tow between the ignition and the battery, isolating the trailer from the tow unless the ignition is on.

Hope this helps.
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Old 12-15-2009, 04:04 PM   #3
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A relay can be installed in the TV with little effort. I intend to mount it in the back of the TV and wire the coil to the lights ( which I always have on when towing ) the tail light wires are easily accessed in that area. Then the contacts are placed in the feed wire from the TV to the trailer. Now the trailer can only drain the battery when parked if you leave the lights on.
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Old 12-15-2009, 08:12 PM   #4
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Thanks for the replies. I think I was confused on when the battery charger kicks in. I figured out that when the TV is in use, the battery is charged by the TV. When the trailer is hooked into power, the battery charger is working. When hooked up to a TV, it looks like I can wire it directly into the battery, but get a relay to not drain the trailer battery. I'm still not sure if the battery would get charged if I ran the TV wires directly through the converter. I pulled out a scamp wiring diagram from the internet and it looks like the TV line coming in is split between the battery and the converter, so I think this is the way I'll go.
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Old 12-15-2009, 09:05 PM   #5
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I pulled out a scamp wiring diagram from the internet and it looks like the TV line coming in is split between the battery and the converter, so I think this is the way I'll go.
Is it the same as the one from our Document Center?
Scamp Wiring Diagram

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Old 12-16-2009, 09:30 AM   #6
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Yes, the same one as the document center. The only thing I didn't see was a baterry charger in the diagram, but it may considered part of the converter.

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Old 12-16-2009, 10:02 AM   #7
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The only thing I didn't see was a baterry charger in the diagram, but it may considered [b]part of the converter.
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