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-   -   Wiring electric fan for thermostat and dash toggle??? (

RRich 04-29-2009 08:23 PM

If they do the job, magnets or not, why worry about it?

Interesting note - I put one on a Jeepster I had (a Hayden?) - in front of the radiator. I used a simple on-off switch. I also had a green light by the switch to remind me it was on that illuminated with the fan. Nothing complicated - KISS.

When driving down the highway I noticed the light came on - with the fan switch off! Thought something was awry at first.

The fan was turning from the air blowing through it, and the fan motor was acting like a generator, powering the light.
So the fan motor must have had permanent magnets.

It even did it when not driving, just facing into a breeze. I had fun with it, I told a friend that's how I kept the battery charged - he believed it!

CJ7Taz 04-29-2009 10:15 PM

Yep, motors generate electricity while they are running too. Thatís what keeps them from burning up. Itís back EMF, a current in the opposite direction to the current applied. That reduces the net current.

From your description, I expect that was a permanent magnet motor but it didnít have to be to act as a generator. There would be enough residual magnetism from hysteresis to start generating current then it would start providing itís own field current.

I didnít address this in my previous post

Originally Posted by RRich (Post 1544527)
Black as ground - Not just battery operated devices, TVs, radios, computers, aircraft, spacecraft, industrial machines, etc. often use black to signify a ground or return.

Henceforth, please make it clear if you are referring to earth ground, chassis ground, signal ground, or some other kind of ground. It can be confusing otherwise.

RRich 04-29-2009 11:02 PM

So you think if he doesn't know which type of ground it is, the fan won't work?

or grounds for divorce?

The project here is to help him get it working, have you completely lost sight of that?

CJ7Taz 04-29-2009 11:09 PM

No, YOU were confusing the issues AGAIN talking about black wire for chassis ground as opposed to white wire for the earth grounded conductor of an A/C system.

Jim_Lou 04-30-2009 05:19 AM

I sure hope you guys are having fun with this 'cause it's making me crazy! :rolleyes:

RRich 04-30-2009 12:46 PM

TAZ - are you talking about a JEEP A/C or a BUILDING'S A/C?

This forum is concerning JEEPS, not buildings! I'm sure you can find a forum dedicated to house wiring - and tell them about how to wire a Jeep!

On a Jeep AC system black is ground - the compressor clutch and the blower motor uses black as the ground - sometimes called the return, sometimes called chassis ground, or in the UK sometimes called earth.

But wire your own Jeep with conduit, J-boxes, wire nuts, solid wire, you can even put a house window air conditioner in it if you want - it's your Jeep! (If you actually have one.)

But be sure to get a permit from the building department and get it inspected before you try to turn on the power.

CJ7Taz 04-30-2009 01:15 PM

I take it that rant is because of the slash. A mere slip of the fingers. Comments noted. Excuse me. A mistake like that could mean the end of the free world.

bandhmo2 04-30-2009 04:47 PM

1 Attachment(s)
Warthog, sorry I did not see this post sooner. Here is a little picture of what you want. Top position on the switch is always on, middle is always off, and bottom is auto. The numbers next to the relay are the numbers used on Bosch type relays if that is what you are using. This drawing assumes that your thermal switch has a switched hot run to it and it closes when up to temp. If your thermal switch grounds when up to temp let me know and I will post a new drawing.

Hopefully, this helps you.

Hank 05-13-2009 12:59 PM

I don't know if thread is still "active" or not after all the banter. The set up that bandhmo2 posted is basically just like the kit I bought from Flex-a-lite and it has worked flawlessly for 3 years.

The kit came with wiring and quality connectors including a bosch relay. I like TeamRush's idea of breakers - I currently have fuses that came with the kit and I may swap over to a circuit breaker. However, I will probably have to order them since the auto part stores in town are not very good. Can you get circuit breakers at Autozone?

CJ7Taz 05-13-2009 01:26 PM

1 Attachment(s)
We haven’t heard back, but we think this is a 2 speed fan. The circuit shown above is for a single speed.

I was waiting on verification before I posted this so as not to confuse the subject.

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