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Old 04-30-2004, 01:19 AM
horvath's Avatar
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Wiring An Electric Fan Using TWO Relays

A photo-tutorial about wiring two relays to handle one 16" electric fan is up at my site:
Click Here

After creating a "power station" on my firewall to deliver full voltage to everything -- Click Here -- (alternator, fan, headlights and dash area), and after doing the two relays (above), my voltage gage doesn't flinch when my fan kicks in!

MadElectrical.com rules!

Alan
54 Chevy Pickup

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Old 04-30-2004, 07:31 AM
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Must run better than new.
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Old 05-01-2004, 12:30 AM
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It sure does! And today I put relays in for my headlights -- WOW! What a difference in brightness: see HERE

Alan
54 Chevy Pickup
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Old 05-01-2004, 06:56 AM
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Really great info Alan. I'm going to be wiring my '53 in a month or two and I'm going to use the dual relay setup for my fan as well. I like the terminal block idea too but I've never been a big fan of fusible links. If I decide to do the terminal block thing I'll use in-line fuses simply because they're easier to replace if they blow.

Centerline
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Old 05-01-2004, 03:49 PM
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Hey, Centerline

Glad you liked my stuff ... I enjoy this so much!

What's your beef about fusible links, bro'? In line fuses will fry every week or so on your fan ... do me a favor and check out my journal on Fusible Links ... then tell me what you think, because i am totally sold on fusible links at this point!

Alan
54 Chevy Pickup
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Old 05-01-2004, 07:14 PM
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Call me old fashioned but I feel its just easier to replace a fuse than a fusible link. It's been my experience that they are a pain to replace and if you use the proper size fuse they will last just as long.

Centerline
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Old 05-02-2004, 12:47 AM
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Okay.

I certainly respect your judgement!

Alan
54 Chevy Pickup
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Old 05-02-2004, 04:21 PM
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very nice job alan! i've saved you're schematic's for my project as well. centerline,... pleased to meet 'cha !! i just live south of ya down in miamisburg
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Old 05-02-2004, 07:36 PM
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Quote:
Originally posted by buxman66
very nice job alan! i've saved you're schematic's for my project as well. centerline,... pleased to meet 'cha !! i just live south of ya down in miamisburg
Nice to meet ya. Actually I'm just up the road in Beavercreek. We have several mid-western Ohio people here. We try to meet up at the Springfield Swap meet a couple times a year. Hope to see you there.

Centerline
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Old 05-02-2004, 10:27 PM
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sounds good! next one is memorial day w/end is'nt it? maybe we can meet up! later,buxman66.
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Old 05-03-2004, 01:40 AM
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The key to that guy's web site is the recommendation to connect the voltage regulator wire @ the distribution block and run a relatively small wire to charge the battery. Goes without saying DON'T ever run a 1 wire alternator!!!! Those were designed for farm tractors that basically have no electrical equipment, just a battery. A 1 wire alternator is regulating voltage at it's own regulator not @ the distribution point so it is difficult to get it to put out enough electricity for a car with a lot of accessories.
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Old 05-03-2004, 03:17 AM
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Every 3-wire alternator I've seen has the regulator wire run two inches over to the BAT connection on the back of the alternator! What is it with these "mechanics" that do this? Are they just lazy? They don't care? Or don't they know the difference?

At any rate, I sure am glad I found MadElectrical.com and Mark Hamilton's generous knowledge base. My truck's electrical system is finally working efficiently.

Alan
54 Chevy Pickup
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Old 05-04-2004, 02:05 PM
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It is an innocent mistake - witness all of the magazine articles praising 1-wire units and diagramming the short jumper on 3-wire units. They just don't realized that the regulator must have a signal from the distribution point to properly modulate the alternator. A lot of 'electrical problems' can be traced to this error and easily remedied as you found.
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Old 05-07-2004, 09:13 AM
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Don't blame jumping the sense wire over to the bat post on the alternator on laziness.
I am rewiring my '50 chevy. I've got an american auto wire kit (came with the truck) and it actually tells you to jumper the wire to the bat post!!! Infact, the plug for the alternator is already set up with a short jumper wire!!!
-alfie
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Old 05-07-2004, 09:42 AM
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Quote:
Originally posted by bigfred1958
Don't blame jumping the sense wire over to the bat post on the alternator on laziness.
I am rewiring my '50 chevy. I've got an american auto wire kit (came with the truck) and it actually tells you to jumper the wire to the bat post!!! Infact, the plug for the alternator is already set up with a short jumper wire!!!
-alfie
You are absolutely correct. Over the years I have collected at least 4 magazine article series on wiring hot rods and every one wires the sensor wire there! As I always say, you can't trust magazine "tech' articles. They are often, if not usually, wrong. In fact, the MAD site that Horvath turned us onto is the first hot rod tech source I have ever come across that gets it right. Thanks Ho'.
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