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Old 08-03-2008, 09:51 AM   #15
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Thanks everyone for the response. I'll change out as we are doing our upgrades.
One question I had was how did you measure the voltage drop before and after installing the LED lights. I can understand a amp drop but not volts.
THANKS AGAIN FOR ALL THE HELP. (some of us need it)
Jerry
The ohms law formula is E=IR. E=voltage, I=current(amps), R=resistance. You can also use I=E over R, or R=E over I.

With a given resistance, when the voltage drops, the amps drop too.

Or you can say that with a given resistance, when the current (amps) drop, the voltage must also drop.

To measure a voltage drop is easy.

First you must have a DC voltmeter.

Then simply measure the applied voltage, in this case to a clearance light at the rear of the trailer, with the old type and then with the LEDS.

Several things can cause voltage drops, above normal.

1. Poor connections.
2. Excessive current draw.
3. Inadequate wire size.
4. Partial short circuit.
5. Corroded terminals.
6. Bad or poor grounds.

Electrical consumption can be related to water consumption.

The more water you require from a source requires that you increase the size of the hose and/or increase the water pressure.

Likewise with electricity. If you want more power, then you must increase the size of the wire (minimizing a voltage drop), or increase the voltage at the source.

This works for DC.

In the case of AC, things work a little different, since you would deal with resistance and impedance. That formula is E=IZ, Z being the resistance and impedance.

As an example, with RV air conditioners such as used by Airstream, when the voltage drops, the current draw will increase because the compressor and the fan motor must work harder.

That's why using a under rated extension cord on an RV, will cause air conditioners to not run properly, and/or become ruined, rather quickly.

Andy
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Old 08-03-2008, 11:39 AM   #16
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Now that's a answer. Thanks and the tip on the extension cord is a good one, too.
One last thing, where do you set the multi meter, at the battary, the converter, or in the line? Thanks again
Jerry
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Old 08-03-2008, 12:25 PM   #17
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Now that's a answer. Thanks and the tip on the extension cord is a good one, too.
One last thing, where do you set the multi meter, at the battary, the converter, or in the line? Thanks again
Jerry
Jerry.

To determine a voltage drop, you must make 2 measurements.

One is at the source of the power, and the other is at the end of the line, namely the load.

In the case of using a "Univolt", if the trailer is plugged into city power, then you would want to check the voltage at the fuse for a particular circuit, then at the load.

If the trailer "was not" plugged into city power, then you would check the voltage at the battery, and then at the load.

While your at it, see if you have a voltage drop between the battery "post" and the battery "clamp."

If you can measure any drop, then you best give the battery posts and clamps, a very good cleaning. Then to keep them clean, coat both of them with a good coating of grease. That keeps the oxygen from reaching the post and clamp, thereby stopping the corrosion from reappearing.

Andy
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Old 08-21-2008, 08:27 AM   #18
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Where are you all finding LED bulbs for the interior lights? The online source that I know of (superbrightleds.com) is a bit difficult to navigate. AND, I can't find any LED equivalent for the halogen reading lights (bulb #TY-67)
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Old 08-21-2008, 08:31 AM   #19
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Where are you all finding LED bulbs for the interior lights? The online source that I know of (superbrightleds.com) is a bit difficult to navigate. AND, I can't find any LED equivalent for the halogen reading lights (bulb #TY-67)
http://led-r-us.com/
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Old 08-21-2008, 03:49 PM   #20
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Great info overland just ordered my catalog thank you
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Old 08-21-2008, 08:18 PM   #21
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Seek no more....Pilgrim. Your search has ended! You are seeking the G-4 rear pin bulb. These are available from IMTRA Marine (and me) at the Forum Courtesy Discount. PM me for more details...........

THANKS!
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