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Old 03-11-2013, 01:20 PM   #1
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Lightbulb Charging while towing??? Still confused



So we are pulling our ntu exp19h with a toyota prerunner. It came prewired with the 7 pin and brake controller. However, the tech that installed the controller said the battery charge pin was not working. After reading several threads and telling the DH to try this, and so and so on the forum said this LOL we still cant figure it out.

There is a fuse and relay under the hood under the label Trailer towing which are both tested and good. But when we test the pin nothing....

Any ideas??

Can we buy just a regular battery charger for this??
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Old 03-11-2013, 02:08 PM   #2
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I would try a new fuse anyways, just to be sure.

It's possible that the wire is compromised somewhere along the line....., did you check the wire on the "back side" of the 7-pin connector?
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Old 03-11-2013, 02:19 PM   #3
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Of course the IGNITION KEY has to be ON as well... My 2010 F150 FORD has both the "trailer tow" fuse and relay installed. These too items were found in glove in an unmarked package. I had no idea what they were for haha...

You might double check the manual and make sure these two items are in the correct fuse holder spot... Your manual should have a pictorial of the fuse panel showing where the fuses and relays are suppose to be located.

If you have someone turn the ignition key "ON" you should hear hear a click in the BLACK RELAY... If you hear the RELAY CLICK it should be a good indication it is working. Perhaps you have a BATTERY DISCONNECT switch that is opened. That would have to be "closed" to get the truck start battery to the trailer battery.

You are missing much by not having that working... the wiring is too small to carry any high currents and the most I can get is a good trickle charge using my truck start battery to re-charge my trailer battery...

Just thinking out loud here on something to check...

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Old 03-11-2013, 02:26 PM   #4
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I do not know if he checked the back of the connector. However the truck was running during these checks so it was on. We went thru every page in the manual and there is no diagram in it. It is however on the back of the fuse case under the hood.

Roy did you mean I am NOT missing much or that I am??? It sounded like you forgot NOT but then maybe I am missing out big time
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Old 03-11-2013, 02:27 PM   #5
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Rustic I will tell him to check the back too!
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Old 03-11-2013, 02:56 PM   #6
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Quote:
Originally Posted by jdesiano1 View Post
I do not know if he checked the back of the connector. However the truck was running during these checks so it was on. We went thru every page in the manual and there is no diagram in it. It is however on the back of the fuse case under the hood.

Roy did you mean I am NOT missing much or that I am??? It sounded like you forgot NOT but then maybe I am missing out big time
I am sure he meant you are not missing much. You will only get a trickle charge effect from your vehicle battery through the plug.
You can charge the battery with a regular charger assuming 12V.
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Old 03-11-2013, 04:23 PM   #7
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Not at all familiar with Toyota, so this may be completely different. Is the wire actually connected under the hood at the fuse box? I know with most GM products, the wiring is there but has to be connected in order to get power back to the trailer harness. In my case there are two terminals located by the fuses for the brakes and 12V battery connection. I had to find the wires under the hood and connect them. This may have already been done, or may not be necessary, just throwing out ideas.
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Old 03-11-2013, 05:35 PM   #8
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A friend of mine with a ford just found out that his trailer was not charging, there is a 30amp fuse and relay that needed to be put in the trucks fuse box, may be the same kind of issue
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Old 03-11-2013, 06:46 PM   #9
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In the fuse/relay box under the hood, there is a 30 amp fuse that is labeled BATT CHG. There is also a relay labeled the same. The fuse should be hot at all times. When the truck is on the relay is powered which then will send power to the trailer connector.
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Old 03-11-2013, 07:19 PM   #10
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Am I correct in assuming if you plug the trailer into the truck with no battery and the lights in the trailer work, your battery will charge.
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