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Relay question
Posted by: strangecars ()
Date: February 03, 2018 08:34AM

I didn’t want to search for the answer.
Can I install a relay on a heater blower and still retain the multiple speeds

Steve Morton
1961 Rampside, 67 and 2 1964 Monzas

Morton's Classic Garage
Parts and Service
Nampa, Idaho 83686
30+ parts cars

Mortonsclassicgarage@gmail.com
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Re: Relay question
Posted by: MattNall ()
Date: February 03, 2018 08:37AM

yes.. just have rewire the switch.





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Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
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Re: Relay question
Posted by: strangecars ()
Date: February 03, 2018 08:38AM

Can I get a diagram of the changes needed ?

Steve Morton
1961 Rampside, 67 and 2 1964 Monzas

Morton's Classic Garage
Parts and Service
Nampa, Idaho 83686
30+ parts cars

Mortonsclassicgarage@gmail.com
[www.facebook.com]

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Re: Relay question
Posted by: Frank DuVal ()
Date: February 03, 2018 08:40AM

Yes, as one uses the relay just for the high speed connection. The low speed, even with the high volume blower, goes through the switch and resistor combination for medium/low.

Same for A/C blower.

It is the extra current on high speed (direct connection) that can be too much current for the switch and cause failure.

Frank DuVal

Fredericksburg, VA

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Re: Relay question
Posted by: strangecars ()
Date: February 03, 2018 08:43AM

So just wire in the relay as usual and the factory switch and resistor takes care of the lower speeds?

Steve Morton
1961 Rampside, 67 and 2 1964 Monzas

Morton's Classic Garage
Parts and Service
Nampa, Idaho 83686
30+ parts cars

Mortonsclassicgarage@gmail.com
[www.facebook.com]

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Re: Relay question
Posted by: MattNall ()
Date: February 03, 2018 08:50AM

Diagram should be in FAQ's





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Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Relay question
Posted by: 63turbo ()
Date: February 03, 2018 09:00AM

Here's the diagram that Matt is referring to:
[corvaircenter.com]

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
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My new fan! [corvaircenter.com]
engine less 62 Spyder
Canadian 64 Monza Parts car



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Re: Relay question
Posted by: American Mel ()
Date: February 03, 2018 10:12AM

Frank DuVal Wrote:
-------------------------------------------------------
> Yes, as one uses the relay just for the high speed
> connection. The low speed, even with the high
> volume blower, goes through the switch and
> resistor combination for medium/low.
>
> Same for A/C blower.
>
> It is the extra current on high speed (direct
> connection) that can be too much current for the
> switch and cause failure.


Please have some patience with me here, as I try to learn.
I do not understand how more juice is being used on the High-speed setting.
It has always been my understanding that the same amount of energy is going through the switch on Low, as does on High, it is just that part of the available energy is shunted off through the resistor to limit the amount that the fan motor sees when running at the Low setting.
Is that not correct?
If not, then what is the purpose of the resistor?

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

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Re: Relay question
Posted by: MattNall ()
Date: February 03, 2018 10:23AM

Screw the science...ggg


experiences have shown that after installing a hi-volume blower.... when on high it tends to blow fuses...





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Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
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..............................110-PG.................................................Webered-Turbo

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Re: Relay question
Posted by: jjohnsonjo ()
Date: February 03, 2018 10:36AM

NO, if you add resistance to a series circuit you reduce the current.

I=E/R

If R goes up, I goes down.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
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Re: Relay question
Posted by: toms73novass ()
Date: February 03, 2018 10:45AM

Also, if you are not familiar with the formula terminology

I=Current
E=electromotive force (voltage)
R=Resistance

smiling smiley

-Tom


63' Monza Spyder Convertable (in process) MY Build Thread
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Re: Relay question
Posted by: MattNall ()
Date: February 03, 2018 10:46AM

Now you've really cornfussed him!! LOL!!





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
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..............................110-PG.................................................Webered-Turbo

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Re: Relay question
Posted by: Bob Helt ()
Date: February 03, 2018 10:58AM

Please have some patience with me here, as I try to learn.
I do not understand how more juice is being used on the High-speed setting.
It has always been my understanding that the same amount of energy is going through the switch on Low, as does on High, it is just that part of the available energy is shunted off through the resistor to limit the amount that the fan motor sees when running at the Low setting.
Is that not correct?
If not, then what is the purpose of the resistor?

NO. Think of it this way.

You have 12 volts available. In the circuit, you have two resistors (lets say r1=10 ohms and R2 is 5 ohms and the motor windings are 2 ohms. (plus the switch contacts).

You also have ohm's law I=E/R So this is just an example.

So on low, you have 10 ohms + 2 ohms. So I = 12/12 = 1 amp thru the switch

On med you have 5 ohms + 2 = 7 ohms. So I thru the switch = 12/7 = 1.7 A

On hi you have 12/2 = 6 amps thru the switch.

See it now?

Bob Helt

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Re: Relay question
Posted by: American Mel ()
Date: February 03, 2018 03:08PM

Thanks Bob!
Yes, that makes sense.
I am going to have to save that.
What I DO know, is that I have NOT blown any fuses yet!

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

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Re: Relay question
Posted by: jjohnsonjo ()
Date: February 03, 2018 03:43PM

No Bob, yes the resistor does dissipate some power, but it also blocks flow. So the current in the entire circuit is reduced.

Think of the electric current as the flow of water through a garden hose. You start to close the valve and less water flows through the hose and the valve as well as the source. The of the water pressure PSI as the voltage. It stays the same on the pressure side of the valve, but is reduced after flowing through.

If you have corrosion on a battery terminal (corrosion = resistance) the starter won't work because there is not enough current. You still have 12v at the battery, but it can't to the starter motor windings, so no power is consumed.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Edited 1 time(s). Last edit at 02/03/2018 03:48PM by jjohnsonjo.

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Re: Relay question
Posted by: strangecars ()
Date: February 03, 2018 03:45PM

WTF.....

I guess,,,,
I'll go get a relay and put it between the switch and the blower. Then run a 12v+ from the battery to the relay.

Steve Morton
1961 Rampside, 67 and 2 1964 Monzas

Morton's Classic Garage
Parts and Service
Nampa, Idaho 83686
30+ parts cars

Mortonsclassicgarage@gmail.com
[www.facebook.com]

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Re: Relay question
Posted by: American Mel ()
Date: February 03, 2018 03:48PM

OKAY, now you guys have me completely lost all over again!

BUT what I do know, is that, . . . . .

THE PM102 WORKS WITHOUT ANY RELAYS, AND DOES NOT BLOW FUSES WHEN TURNED ONTO THE HIGH SETTING ! ! !

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

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Re: Relay question
Posted by: jjohnsonjo ()
Date: February 03, 2018 03:58PM

Hi Steve, sorry didn't mean to cause confusion. I'm am running just fine without a relay. Like I said in another thread, these new HD motors don't use as much current as the old ones.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

Image and video hosting by TinyPic

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Re: Relay question
Posted by: strangecars ()
Date: February 03, 2018 05:11PM

No problem J.O.

Steve Morton
1961 Rampside, 67 and 2 1964 Monzas

Morton's Classic Garage
Parts and Service
Nampa, Idaho 83686
30+ parts cars

Mortonsclassicgarage@gmail.com
[www.facebook.com]

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Re: Relay question
Posted by: 66vairman ()
Date: February 03, 2018 05:24PM

O.K. calm down. A lot of good information.

A resistor does RESIST current flow and in the process that resistance generates heat so less current gets to the blower motor. Also why the heater motor LO and MED resitors are wire wound and mounted in a location away from heat sensitive material.

The fan switches, while marginal, did work fine WHEN NEW. I've had a number apart to repair and the main problem is the lubricant is dry combined with some dirt that makes a poor connection which results in resistance and HEAT at the contacts.

Four out of five I've salvaged (clean repair contacts) and lube with Di-electric grease and they work fine.

Having said that I do use a relay for HI (only) to reduce current on HI at the switch so the fan switch is cooler and the lube will last longer.

Speaking of resistance - the fan ground goes through a few connections (heater housing) that RESIST the current flow back to ground. Connect a 12GA wire directly from the fan housing to the body and you'll increase the current flow on HI.

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