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Old 02-25-2021, 07:19 PM   #1
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battery problem

I have a 1997 Newmar Mountain Aire motorhome. I started my motorhome with no trouble but I realized I had only headlights but no tail lights. My batteries are located up front in the engine compartment There is a single battery on the left and two connected batteries on the right. I saw a small red cable next to the single battery on the left that was not connected. I attached the cable to the wing nut that was holding the cables on the positive post on the single battery. Now not only did my engine start, but I had tail lights. So I thought I should properly attach the tail light battery cable to the positive post. Now I have no headlights or tail lights and no power to start my engine. Where should this cable go so I can start my motor home and have tail lights.
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Old 02-27-2021, 01:04 AM   #2
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Initial thought is that lighting is blowing a fuse? so someone disconnected to troubleshoot?
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Old 02-28-2021, 12:45 AM   #3
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Have you owned it for a while and the tail lights have worked in the past ?
If the tail lights have worked before it doesn't make sense the wire would be just hanging there. Being over twenty years old I would think that wire was from an add on, stereo, fog lights, USB port, radar detector, ... any chance it's been there and you just didn't notice it before?
The single battery used for starting should have a junction up at the terminal or at the starter where power is taken and fed to a fuse panel to power items from the ignition switch and lights.
I would disconnect that wire again and check the fuses.

If you find a bad fuse in the lighting circuit you might want to check the rear bulb sockets for corrosion that might cause a short.

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Old 02-28-2021, 06:35 AM   #4
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Originally Posted by greggoudy View Post
I attached the cable to the wing nut that was holding the cables on the positive post on the single battery. Now not only did my engine start, but I had tail lights.
It appears you had it right, for that moment.

I donít know how your electrical system is laid out.

If the grounds arenít tied to a common point...youíll have to keep the positive on the same circuit as the negative for the lights. If you have any 6-v have to make sure the positive terminal you chose isnít giving you only 6v vs 12v. Avoid the positive that is series tied to the other battery in the pairís negative terminal. That is IF you have two 6v batteries joined to make a 12v system.
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battery, problem

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