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Old 03-11-2013, 08:34 PM   #11
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Have you looked into the Toyota Forums on this?

I did a quick check and on a Tundra forum and what dlfeather is saying is correct. I don't think Toyota is the quite the same as Chevy and Ford where you have to install the fuses, and in Chevy 2007+ actually connect the wires to the terminals. I'd start with the Fuse and/or relay under the hood before I went looking wire shorts.

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Old 03-11-2013, 08:55 PM   #12
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jdesiano1 - YUP - I left out the word "NOT" My brain works faster the fingers do I guess...

No way can I depend on the 12VDC DC line coming from the truck start battery to re-charge anything back on the trailer side... Too small of wires and too far away. In order to recharge your trailer deep cycle battery in a quick three hours or so you have use around 14.4VDC at 20AMPs... Using your truck alternator system doing this will get its sensing information from the closest start battery and think that your the battery is charged and shut down its charging mode. The trailer battery is so far away in feet from the truck alternator system sensor it doesn't know its there to be charged....

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Old 03-19-2013, 12:31 PM   #13
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My Silverado was factory prewired with the charging line but it was not connected at the fuse block and did not have the 40a fuse installed. My owners manual stated the fuse and wire needed to be installed by the dealer but it was a simple process. The charge wire isn't very thick but it's thicker that the wires on my Battery Tender that does the same thing...it's a low amp, trickle charge anway. BTW, I think that charge wire is only energized when my lights are on or when the trailer tow button is activted.
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Old 03-19-2013, 01:21 PM   #14
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On my 98 Silverado the wire was there but I had to lay it down in fuse block and put the fuse in it was per wired but not in the fuse box
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Old 03-19-2013, 01:42 PM   #15
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Don't know about other years, mine is always hot, key on or off, doesn't matter. What is supposed to happen in tow mode or with the headlights on, is the alternator will kick up the charge rate to help charge the battery on the trailer. How well it works, I don't know. We usually have electric most places we camp, so the converter most likely does most of the charging.

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