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Old 02-23-2013, 03:19 PM   #1
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12 volt power outlets

I have 2 12 volt outlets on the dash. When I check with my voltmeter I have 12.36 volts on both. When I plug a cell phone or gps charger in it drops to 6.8 volts. Suspicious of fuse but I have spent a good bit of time checking and have not found one labeled for the power outlets. I pulled all the fuses under the hood and none blown. Anybody know where the fuse is or have any suggestions?

Thanks
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Old 02-23-2013, 03:28 PM   #2
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It could be a loose fuse or bad ground. The dash 12 v fuses are usually on the main chassis fuse block usually around the steering wheel area.
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Old 02-23-2013, 04:00 PM   #3
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Hi dwmcg,
In the electrical bay (where the shore power cord is located) there may be automotive fuses behind a panel on the back wall of the compartment. The panel may be held on with Velcro. Sometimes the automotive fuses are located in a basement compartment forward of the left front tire. This is in addition to the electrical bay location. My experience is with Spartan chassis.
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Old 02-23-2013, 06:49 PM   #4
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The 2000 DSDP doesnt have a compartment forward of the left front tire. It does have fuses under the dash in front of the steering wheel. There are also fuse blocks under the hood, over the generator in a enclosure covered with a piece of plexiglas. In that cabinet there will be at least two, maybe three black rectangular boxes that hold fuses. The covers snap on and off with fragile plastic clasps... be careful removing. There are also a set of black retangular boxes in the right rear electrical compartment where the inverter is located.

Look under the dash...
Then under the hood...
last (but unlikely) in the electrical compartment.

Our coach is in storage so I can't check to see where that fuse is, but think it might be on the dash fuse block.
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Old 02-23-2013, 07:17 PM   #5
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I've not heard of a voltage drop problem from a fuse, they either pass electricity or burn out and stop it. How are you measuring voltage with a charger plugged in the socket? At the output of the charger or the connections on the back of the socket?
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Old 02-23-2013, 07:28 PM   #6
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dwmcg,

Sounds like you have "collapsing voltage". The only thing powering your Dash 12v outlets is the 5 watt solar panel. If you check it at night time, you'll probably read "0" volts. Using the volt meter might "collapse", or reduce the wee bit of voltage you see in the day time.

I had a similiar situtation a year or so ago. Mine is a gas rig and I have the Newmar (the house builder) fuses above the Speedometer. I wrote this up and I followed with pictures showing my problem on this Forum. Take a look- go to page 3 of the thread to see the pics. You'll have to find your coach fuse panel and see if it has power to those fuses.
My problem was a burned out connection from the main, (Positive) red cable battery power connector to the printed circuit board that supplies the power to all those fuses. I read as high as 17v in bright sun at the dash plugs, but it collapses immediately when you plug something into them.

Either your fuse is blown, or no battery power is getting to that fuse.

Repairing that main terminal connection solved my problem.

Good luck with yours--
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Old 02-24-2013, 09:11 AM   #7
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Hi BFlinn181,
I once thought the same as you. A problem with my HWH system turned my world upside down. The HWH tech said replace the fuses. While initially objecting because I had checked them with a meter, I did replace the fuses and the problem went away. While rare, a fuse can carry a load, but not enough of a load to operate a close to maximum capacity. At the time, I thought there goes 50+ years of electrical DIY. And I thought I knew it all (well almost all).
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Old 03-18-2013, 01:40 PM   #8
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After replacing every fuse on the coach (that I could find) I ran a new hot wire to the outlets with an inline fuse and now they work. Thanks for the replies.
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Old 03-18-2013, 09:08 PM   #9
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I may be a little late, but I had the exact symptom, 13.5 V at cig lighter & acc plug. plug in cell phone 5.4 v. looking at fuses under dash cover I found 20 amp fuse labeled Cig ltr, front row last on right,it was good. 3 fuses to the left labeled Acc. fuse was bad, replaced 13.4 with cell phone plugged in. 2000 DSDP 38'
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Old 03-19-2013, 10:41 AM   #10
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That was my symptom exactly. I replaced every fuse out front under the plexiglas panel and made no difference. Needed to any way because several holders had the wrong amperage fuse in them. Now they are all correct. I still believe there is a fuse I did not find but they work now.
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Old 03-19-2013, 12:52 PM   #11
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Maybe a little different electrical setup. I see you have a Cummins, so it's a Spartan Chassis. Mine's a Freightliner with a Cat. It has an electrical panel with fuses accessible through a "hatch" in the dash over the Instrument panel, best thing since sliced bread, you can get to all the dash wiring & fuses without Standing on your head, which isn't as easy as it was 40 yrs ago, Yoga or not. Art.
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Old 03-19-2013, 03:07 PM   #12
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The fuses aren't that hard to get to. I just didn't find one that made any difference.
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