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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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Old 04-08-2016
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Kiwi3 Kiwi3 is offline
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Default DC voltage - a tad high

While I know we need more than 13 to push a charge into batteries, shouldn't the rest of the 12V DC circuit actually be at 12V and not 13V? I just fried out the power wires to my back up camera with the 13V DC - they were small from the factory. I fixed the problem on the backup camera and display with two buck converters and dialing the voltage down to 10V (they both have op ranges of 9-12V).

Is there a voltage regulator on the DC bus that I should be checking and if so where? I didn't see anything that looked like an automotive regulator when I had the lower bus open.
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Old 04-08-2016
brhodes brhodes is offline
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Your alternators should be putting out around 14.2 volts DC when the engine is running and all of your DC equipment should be rated at up to 16 VDC.
Sounds like your camera had a short or a bad connection which will cause heat which can and will burn a wire if the fuse or breaker is too large or fails to open.
What is you voltage readings when the engine is running and the alternator(s) are producing power? Also what is the charge voltage from your Inverter/Charger system?
These need to also be chaecked to ensure you do not have an issue with an alternator regulator or an over voltage issue with the inverter/charger system
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Old 04-08-2016
konehd konehd is offline
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What Barry says is right, anything that you want to run on the coach DC should be able to take 15-16v without failure.

If you need 12v you can get a DC-DC regulator like this...
http://www.ebay.com/itm/321795754199



HTH, Joe
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Old 04-08-2016
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Ah. Thanks. I'll get her started and check the outputs tomorrow morning. The 13V was sitting plugged into the 50 AMP pedestal at home.

The camera and monitor were some cheapos that I put in as a stopgap as the original system had died and I didn't want to spend the money on a real system right now. So - China, 9V-18V on the box but the wires heated up immediately upon applying current. The camera wire looked to be a 20-22 gauge and it just melted immediately. Adding the buck converters took care of the problems for those two.
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Old 04-08-2016
brhodes brhodes is offline
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That's a fire hazard and I would cut it out immediately and throw it in the trash.
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