How many things can i run on a 6V reducer (runtz)

[tankwilson]

I rewired my car to 12v last year but still want to run the heater and defroster fans. I am getting ready to order the "runtz" voltage reducer. How many do i need? One for each thing or can i run more than one thing on one runtz?

Thanks

matt

[No Bux Rod]

Matt,

What are the specs. on the Runtz voltage reducer? Some are just resistors and others have regulator crcuits in them. In either case you need a guess on the power, actually current, each fan motor draws on 6 Volts. With this data we can answer your question.

N B R

[greg g]

I believe you can run the heater fans on 12 v as long as you have your switch hooked up, it should run fine albiet a bit faster on the low speed settings, the switch has a built in resistor that already provides lower voltage. The only time 6 v passes through the switch is at high speed, ie the unresisted circuit of the switch.

Check the switch output with a volt meter, probably get like 2.5, 4.5 and 6, then put 12 through it. bet you get 5, 9. 12. 6 and 8 would be fine for the fan, plus with 12 v they will be drawing less amps. (ohm's law being what it is.)

[tankwilson]

So i can hook up the fan switches to 12v and not burn up anything. I only need the runtz for my dash clock then.... right?

[daddyo23]

Your gas gauge will need one. And our amp gauge, if you're using it. I think you need the ceramic reducer for the heater. Wayne P.

[tankwilson]

i've been told that i don't need one for the amp gauge??? is this right or wrong? Pete... wanna chime in on this one.... please

[BeBop138]

You won`t need one for the amp guage if you alt or gen does not put out more amps than what your guage reads at it`s highest reading.If it goes over it may cause a fire. Otherwise you will need to run an aftermarket guage or have your original recalibrated. I am using a 42 amp alt and my guage reads highest at 50 amps, so no problem----if you run an alt I would fuse it also. For my wiper motor I used a one ohm 50 watt Dale aluminum clad power resistor--I ran all my reducers before the switches. If my memory serves me I used a 47 ohm 10 watt resistor for the gas guage, a little over kill on the wattage but I used what I had on hand. As far as the fan motors why not get some 12 volt fans from a donor car.

[jd52cranbrook]

Amp gauge is a amp gauge not a voltage meter. No drop is needed. But if you are changing to 12 volt neg ground you just need to swap the wires in back.

I was told, and have experienced the results, one runtz for each gauge or item. Different currents going through the voltage drop from more than one source, or gauge, will end it's life very quickly.

I am running a 80 GM alternator, with a 50 amp main circuit breaker, or main fuse. The amp gauge never goes over 20 amps if that, and I am running AC, two amps, two sub woofers.

[tankwilson]

Here's how i gonna do it.

wire up the heater switches to 12v

wire up dash clock using the runtz

hook up my amp gauge backwards.

Now what about the fuel gauge???

[JIPJOBXX]

And this is what happens if you screw up on your wiring!!!!

[greg g]

Check the switch by feeding it with your battery charger or jump it from another 12 v source. power to switch line out to volt meter to ground then see what the meter reads at the different settings on the blower switch. I wouldn't hook up anythig with out testing it first.

If you let the smoke out of electrial stuff, it won;t work again.

[tankwilson]

Don't worry guys i rewired the entire car myself without a wiring kit. Also wire custom choppers (up to $100,000) everyday at work.

Just need to know what needs to stay 6V and what i can change to 12.

[jd52cranbrook]

fuel guage needs a drop too.

[jd52cranbrook]

You may want to get a ceramic voltage drop for you heater. There will be more, and different amounts of current going through it, depending on the blower speed. I found them at truck stops, or truck parts stores. Either ceramic, or some kind of heat sink on it.

[jd52cranbrook]

Same for your wiper motor if it is electric.

[tankwilson]

I figured i would wire a runtz before the wiring going to the switches this way the switch/s and motor/s will see the 6V they are use to and the ceramic on the switch will work like stock. Make sense???

[jd52cranbrook]

But the current to ground will still vary through the drop. The source is still starting at the drop, and with different items turned on or off, it makes the current vary. Runtz drops do not like varying current. Other than that they are good to go.

[tankwilson]

So get ceramic drops for the heaters and use the runtz on my clock and fuel gauge or just the clock.

[jd52cranbrook]

This guy has some good info

www.fifthaveinternetgarage.com

or 785 632 3450

He sells drops by the bags.. If you can, get them from him, all set up for you.

one for the guage and one for the clock.

[Young Ed]

Pete had to switch his heater motor to a 12v one. The 6v one melted. He was able to find a new 12v motor that fit perfectly in place of the 6v one. Thats the route I would take.