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My transformer is only putting out 11.4 volts to a 12 volt bulb and the is bulb new, it ohms out good also. So, If I wire in the tranformer that is 13 volts, that is putting ou 12.8 volts on the meter, will it damage or burn out the bulb, or shorten the life of the bulb?

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Basically, it won't harm your bulb sir since it has levels of tolerance. if you have the tolerance data of your bulb, something that appears like +/- xxxV, then it will help you determine the tolerance level of your bulb. it wont shorten the lifespan of the buls also.

Posted on Sep 15, 2009


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What is the condition of the bulb socket? Contacts show signs of corrosion or overheating? Use a meter to find out if it's missing the 12 volts to the bulb or if the ground is missing (open/high resistance). With the fog lamps powered on, connect the black meter lead to a good solid ground on the body of the car. Touch the red meter lead to each contact in the socket which the bulb plugs into. One of the contacts should measure about 12 volts. If no 12 volts then you will need to check fuses and wiring to find the open circuit causing the no voltage situation. If you measure 12 volts, then you know you have power to the bulb. The problem will then be with the ground. Turn off the fog lamps, set the meter to measure resistance (ohms). Leave the black meter lead connected where it was. Connect the red meter lead to the contact in the bulb socket that you did NOT measure the 12 volts at. The meter should read no/low/minimal resistance. If you measure high resistance, then you will need to locate the corrosion or open/broken wire between the bulb connector and grounding point on the car. Good luck!

Oct 18, 2014 | 2004 Hyundai Santa Fe

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Will my new LED malibu lights work with with my ML200RT transformer? They use considerably less wattage than my old bulb type lamps.

Malibu puts out 12 Volt AC without specifying type of bulb
If new bulbs work on 12 Volt AC, then they should work

Wattage on bulbs should match power pack wattage, or damage can occur to power pack.
Buy new power pack, call Intermatic, or Try it out and see if it works

Sep 05, 2014 | Hardware & Accessories

1 Answer

Smartpool inground nightliter ultra n55, on off button has stopped working, does this mean the switch is bad or do i need a new bulb?

The 5 amp fuse for overload protection might be blown. Next remove the bulb and check if 12 volts is at the bulb socket. If the fuse is good and you have 12 volts at the bulb socket, then the bulb needs replaced with a new one. If the fuse is good and you do not have 12 volts at the bulb socket, the switch or transformer is defective. You can check the switch by disconnecting the wires to the switch and using an ohmmeter. Place the probes, one on each terminal of the switch. Then close the switch. It should read zero ohms. Open the switch, it should read infinity or maximum ohms. If the switch does not give you these readings, the switch is defective. If the switch is good and everything else checks out good, then the transformer is defective.

Jun 04, 2014 | Cars & Trucks

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I have 3 landscape lights that were working but quit working in a system with about a dozen other lights that continue to work. I presumed the bulbs needed replacement but that didn't help. I verified...

My experience has shown that this is nearly always a connection and/or wire corrosion issue. Be certain that all connections are clean-if not clean with fine grit sandpaper or replace. Remember these devices are exposed to the weather on a continuous basis.

Nov 04, 2013 | Intermatic Malibu 300W Power Pack...

1 Answer

We have a lutron nova 2003p (1600 watt) switch supplying power to a line of 18 12 volt, 50 watt lamps. switch went out. is this caused by over-amperage draw?

Hi John, I'm an electrician and I think I can help you with this problem.

First and foremost, this switch's 2000VA / 1600W electrical rating is based on a incandescent load.

Let's do do the math on this one.. 18 x 50 = 900 watts. So, you're under the 1600 watt capacity, but I think this is a bit more involved than this.

I'd be willing to bet that you're not dimming a 12 volt circuit - but rather a 120 volt circuit that supplies one or more transformers that step the power down from 120 volts to the the 12 volt bulb voltage. A transformer is an inductive load. A transformer's inductive load is completely different than the incandescent load the dimmer is designed to control. The transformers are rated for 120 volts and will have issues including heat problems if provided less than the rated input voltage to provide a reduced output voltage you want so that you can dim these lights.

This switch will not work on the output of the transformer in this situation either because the significant amperage being switched here. Each of these lamps draws a bit over 4 amps as determined by ohm's law: 50W / 12V = 4.16A. The total load at 12 volts is (again, Ohm's law) 18 x 4.16A = 74.88A ! That means the wire would need to be a #4 or #2. This is about the size of the cable on your car's battery (only amperage determines conductor size - voltage determines insulation).

A dimmer on this circuit will not work unless the fixtures are changed so that no transformers are used to supply the lamps. This includes fluorescent lamps (compact or otherwise) unless the packaging specifically states that they can be used on a dimmer.

You may wish to contact Lutron Hotline at 800-523-9466 for additional help and suggestions. I hope this helps & good luck!

Mar 29, 2012 | Lutron Electrical Supplies

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Need a fan motor for millermatic 135 part#196 063

If You are wanting to avoid the high price of an official replacement, you can use an exhaust fan motor from an inexpensive exhaust fan from a home center- but you will need to locate a 24 volt transformer of about 1 Amp capacity -24 Volt Amps. These are used in furnaces so one pulled from a scrapped furnace will also save some cash.

It is a matter of locating the transformer out of the way, then clipping the wires that go from the control board to the old fan motor, Locations on the PC board of 12 and 13 and making those connections. Then running the primary leads and the new fan leads together to the AC power coming in. On 220, you are only going from one hot to return, so your nominal votlage for fan and transformer remain at 115 volts. Terminals 11 and 15 on the Control board.

Since the original was a nominal 24 volts, using a discrete transformer may leave you with a faster than expected feed rate you cannot slow down significantly. If that happens,either put resistance in series with the transformer output, 1,2 or 4 Ohms will slow it down some, as will changing the speed control potentiometer itself.

Miller used a 2500 Ohm linear taper potentiometer in most cases. Raisng the resistance to 5000 Ohms will also slow down the feed rate and using a 1000 ohm linear taper potentiometer will speed it up as well.

Jan 03, 2012 | Welding Tools

1 Answer

1999 GMC Jimmy 4.3 gets P0303 (#3 misfire) Changed plugs, cap, rotor, wires. Did not help. Read GM tech bulletin and replaced fuel injection system from SCPI to MFI. Did not work. Checked #3 plug again...

Yes . You need an ohm/ volt meter. First check the injector, at the leads of the injector you should have 11 to 15 ohms. At the injector plug with the ignition on you should have 12 volts at one of the wires. To check for fire at the plug put the meter leads on the plug leads and crank the engine. the voltage should spike. My guess is that you have a bad wire on the #3 injector. All the injectors will have 12 volts with key on. The ECM grounds the injectors according to where the crank/cam sensor is. On your vehicle it fires 2 cylinders at a time. This is why I say you have a bad /broken wire. At the #3 injector plug you can also check for ground to the ECM. Instead of putting both leads to the plug you have to first find the ECM wire, then put the meter leads to that wire and ground on the battery. Again it should spike in ohms

Sep 05, 2011 | 1999 GMC Jimmy

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Power into unit ok power comming out of unit is very dim.

If you have a volt meter, check the voltage, I believe it is supposed to be 12 volts.
Are your bulbs the proper voltage rating, that is 12 volts.
Do you have enough bulbs connected to the transformer, connected load should be close to 121 watts when you add up all your bulb wattages.
Don't confuse volts with watts. The transformer reduces voltage to 12 volts, but the wattage of the transformer is 121 watts. Each bulb must be 12 volts but wattage (brightness) can vary depending on the fixture from maybe 7 watts to over 50 watts.

Dec 01, 2010 | Intermatic Malibu 121W Power Pack...

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Fan on my big buddy heater just stopped working changed batteries still not working?tried the switch nothing .i only have radiant heat.

I would first check the wiring connections to fan and get a multi meter , set on 12 volts dc and see if fan motor has 12 vdc input voltage.
Too cheap to buy a voltage tester at wal mart ot harbor frieght, you can use a 12 volt bulb and socket, if you already have one. Remove fan wires & hook up 12 volt light bulb & if it lights, you got the juice. Carefull,dont let live wires touch because you short out $26.00 big buddy fan transformer. work with fan transformer unplugged from wall and dont plug in until you sure no wires touch.
use electrical or duct tape. electrical tape better.

otherwise,just buy the multi meter, they only $8.00 to $10.00
read & understand instructions, before you try to use it. otherwise,you could burn out your new meter.

well worth owning &
learning to use multi meter. I use it thousands of times.

if fan motor has juice but wont run, check fan shaft to see if it turns freely or scrapes or is stuck. oil fan motor bearings ,change the brushes.
make sure that the fan blades are not touching the fan housing and can turn freely.
if it still dont work, buy new fan motor.
if no juice at fan motor, check mr heater switch with the power off,unplug transformer from the wall or remove batteries.,
and use the ohm meter setting of the multi- meter to test for continuity of the switch when the switch is in the on position.
power must be off when using the ohm setting of a multimeter.
if power is on & using the ohm setting of the multi meter, you will blow out the multimeter. The ohm setting uses a 1.5 volt dc battery inside the multimeter to test for a compleated circuit.
so, 12volts dc would blow it out on ohms setting.
If the switch is good,reinstall it on mr.heater and test the output of the transformer or battery compartment using the 20 volt dc scale of the multi meter. the voltage scale you select ,must be higher than the voltage you expect to find ,in order to avoid damage to the multi meter.
observe polarity,positive to red and negative to black.

the dc voltmeter setting is totally polarity sensitive and a reversed hook up could blow out the meter.
multi meter means it can read ac volts, dc volts,ohms and dc amps. Read and understand the included instructions before using a multi meter
a good single battery in new condition reads 1.62volts dc
1.5 vdc is almost dead, a good used battery reads 1.58 to 1.6 vdc
below 1.58 vdc is weak battery and 1.48 vdc is usually totally dead, but may be enough for momentary usage under 1 minute.

Sep 08, 2010 | Mr. Heater Big Buddy Heater

1 Answer

Reciever will not turn on, has power before the main transformer but none after?? woud that be the transformer or would it be another component?

the transformer has a thermal cut out inside the winding.if you peel back the varnish coated paper where the wires go in ,you will see a cylinder .about 1/2 inch long with a cone shaped end.The thermal rating is on it.Replace that and it works again.
The typical output on that type of tranformer is a 12v 36 volt and 100 volt center tap winding set.when rectified,will put out +-9,+-27 and +-70 volts .

Feb 12, 2010 | Yamaha RX-V1700 Receiver

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