---"80 Amp automotive breaker:
---75 Amp heavy-duty relay:
---Much of this is overkill -- the fan pulls 40amps continuous, so a 75amp
---relay is overkill, as is the breaker, but it's better than taking a risk
---of melting a cheap 40 amp relay."
If the fan only pulls 40 amps continuous, and maybe spikes to 50-60amps on
initial start up, the 80 amp circuit breaker isn't what I'd call overkill,
but not enough. You want the amp rating to be closer to the actual draw.
That way if there is a problem, it will trip the breaker/fuse long before it
causes any damage to the rest of your components. Ideally you want your
breaker/fuse to be lower than your relay, right now of the parts you
bought(other than the fan) the relay is your weak link and could possibly be
damaged before the breaker gets tripped.
brian cropp
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Matt Beazer
Sent: Friday, June 19, 2009 1:30 AM
To: dakota-truck@dakota-truck.net
Subject: Re: DML: Taurus Fan Update
As promised, here's some pics of the wiring stuff for the fan I've
picked up:
Adjustable temp Derale fan controller, w/AC override:
http://www.moparhowto.com/pictures/1995-Dakota/radfan/fan_controller.jpg
75 Amp heavy-duty relay:
http://www.moparhowto.com/pictures/1995-Dakota/radfan/75amp-relay.jpg
http://www.moparhowto.com/pictures/1995-Dakota/radfan/80amp-breaker.jpg
8 gauge wire:
http://www.moparhowto.com/pictures/1995-Dakota/radfan/8gauge-wire.jpg
1N5408 Rectifier Diode 3A 1000V:
http://www.moparhowto.com/pictures/1995-Dakota/radfan/rectifier_diode.jpg
8 gauge ring terminals:
http://www.moparhowto.com/pictures/1995-Dakota/radfan/ring_terminals.jpg
I picked up the wire and terminals, relay and breaker cheap online at
http://www.nulime.com. I had to order the rectifier diodes separately.
The rectifier diode is just to bleed off any voltage being returned from
the fan if it turns into a generator due to airflow when it's off to
prevent feedback into the relay.
Also included in the amp wiring set I picked up (it was like 11 bucks
and included all the wiring and some extra stuff) is an inline fuse
holder (only 60 amps though):
http://www.moparhowto.com/pictures/1995-Dakota/radfan/alternative_fuse.jpg
If you want to save the 30 bucks on the breaker then I'd get one of the
above inline water resistant fuse holders with an 80amp fuse. I went
with the breaker since I figured it was more durable than a fuse, and
it's easier to flip a breaker during an accidental overload than it is
to find an 80 amp fuse on the side of the road. Plus it'll make it
easier if I need to pull the rad fan to make sure all power is
disconnected rather than unplugging the battery.
I plan to hook it all up, then use a friend's automotive scanner to
watch the temp reading from the coolant temp sensor to set the fan
kickon temp to around 195 degrees, that way it won't run on the highway
if it's getting enough air in the front end to keep cool.
I'm thinking of going to the local automotive junkyard and see if I can
find a Taurus I can rip the 3 prong connector out of too, make things a
little easier to disconnect if needed.
MattB
Dan Kramarsky wrote:
> Matt,
>
> I just order same fan. #35317. For $42 I will give it a shot too!
Keep us updated with your mods and wiring diagrams.
>
> My wiring will be really simple to start with. Just a 75-amp relay and a
switch under the dash. Then I will get into the thermostat setups.
>
>
>
>
>
> Dan K.
>
> Vehicle 1: 1992 Dodge Dakota Club Cab LE Color: Two-tone silver
Engine: 5.2L EFI Mods: Home-brew CAI, March pullies, K&N Filters, Relocated
IAT, DynoMax Turbo Exhaust and Hi-Flow Cat. Race weight: 3700 lbs.
>
> Photo: http://static.flickr.com/42/84856795_c18903d10f.jpg
>
> Vehicle 2: 1993 Ford Crown Victoria LX Color: White Engine: 4.6L EFI
Mods: none yet.
>
> Photo: http://farm4.static.flickr.com/3098/2726734706_3f511ec702.jpg
>
>
> --- On Fri, 6/5/09, DML Digest <owner-dakota-truck@bent.twistedbits.net>
wrote:
>
>
>> From: DML Digest <owner-dakota-truck@bent.twistedbits.net>
>> Subject: DML Digest V5 #3755
>> To: dakota-truck-digest@twistedbits.net
>> Date: Friday, June 5, 2009, 9:00 PM
>>
>> DML Digest
>> Saturday, June 6 2009
>> Volume 05 : Number 3755
>>
>>
>>
>> The subjects discussed in this digest are:
>> ==========
>> DML: Taurus Fan Update
>> Re: DML: Taurus Fan Update
>> Re: DML: Taurus Fan Update
>> Re: DML: Taurus Fan Update
>> Re: DML: Taurus Fan Update
>> Re: DML: Taurus Fan Update
>> DML: Quality time final
>>
>> ----------------------------------------------------------------------
>>
>> Date: Fri, 05 Jun 2009 02:30:47 -0700
>> From: Matt Beazer <teseract@moparhowto.com>
>> Subject: DML: Taurus Fan Update
>>
>> Finally got the fan today, so I took some pics with a tape
>> measure. The
>> one I'm most concerned about is this:
>>
>> http://www.moparhowto.com/pictures/1995-Dakota/radfan/fan_depth.jpg
>>
>> Looks to be 4.75" max depth, with my wife holding the tape
>> measure a bit
>> crooked. Note that the shroud can't be trimmed for
>> less depth, I put a
>> straightedge over the hub, there's only 1/8-1/4" clearance
>> before the
>> hub would be rubbing the radiator if trimmed.
>>
>> Then we have:
>>
>> Height:
http://www.moparhowto.com/pictures/1995-Dakota/radfan/fan_height.jpg
>> Width:
http://www.moparhowto.com/pictures/1995-Dakota/radfan/fan_width.jpg
>> Back: http://www.moparhowto.com/pictures/1995-Dakota/radfan/fanback.jpg
>> Front: http://www.moparhowto.com/pictures/1995-Dakota/radfan/fanfront.jpg
>>
>> This thing definitely pulls some power considering how
>> thick the wires are:
>>
>>
http://www.moparhowto.com/pictures/1995-Dakota/radfan/fan_wirethickness.jpg
>>
>> Apparently they didn't want another fan broken as they
>> shipped it in a
>> huge box:
>>
>> http://www.moparhowto.com/pictures/1995-Dakota/radfan/fan_box.jpg
>>
>> The white box is about the same dimensions of the fan...
>> sheesh. And
>> Fedex STILL managed to snap off a tab (that I'd have to
>> trim anyhow).
>>
>> I'm ordering some 8 gauge wire, a 75amp relay, and an 80
>> amp automotive
>> circuit breaker tomorrow. I'll use a Derale
>> adjustable fan controller
>> to trigger the relay on at 195 degrees (180 degree
>> thermostat installed)
>> or when the A/C is on.
>>
>> We'll see how she fits...
>>
>> MattB
>>
>> ------------------------------
>>
>> Date: Fri, 5 Jun 2009 07:32:22 -0700 (PDT)
>> From: Phillip Batson <pbatson68@yahoo.com>
>> Subject: Re: DML: Taurus Fan Update
>>
>> Awesome! Keep the updates coming!!
>>
>>
>>
>> - ----- Original Message ----
>> From: Matt Beazer <teseract@moparhowto.com>
>> To: dakota-truck@dakota-truck.net
>> Sent: Friday, June 5, 2009 4:30:47 AM
>> Subject: DML: Taurus Fan Update
>>
>>
>> Finally got the fan today, so I took some pics with a tape
>> measure. The one I'm most concerned about is this:
>>
>> http://www.moparhowto.com/pictures/1995-Dakota/radfan/fan_depth.jpg
>>
>> Looks to be 4.75" max depth, with my wife holding the tape
>> measure a bit crooked. Note that the shroud can't be
>> trimmed for less depth, I put a straightedge over the hub,
>> there's only 1/8-1/4" clearance before the hub would be
>> rubbing the radiator if trimmed.
>>
>> Then we have:
>>
>> Height:
http://www.moparhowto.com/pictures/1995-Dakota/radfan/fan_height.jpg
>> Width:
http://www.moparhowto.com/pictures/1995-Dakota/radfan/fan_width.jpg
>> Back: http://www.moparhowto.com/pictures/1995-Dakota/radfan/fanback.jpg
>> Front: http://www.moparhowto.com/pictures/1995-Dakota/radfan/fanfront.jpg
>>
>> This thing definitely pulls some power considering how
>> thick the wires are:
>>
>>
http://www.moparhowto.com/pictures/1995-Dakota/radfan/fan_wirethickness.jpg
>>
>> Apparently they didn't want another fan broken as they
>> shipped it in a huge box:
>>
>> http://www.moparhowto.com/pictures/1995-Dakota/radfan/fan_box.jpg
>>
>> The white box is about the same dimensions of the fan...
>> sheesh. And Fedex STILL managed to snap off a tab
>> (that I'd have to trim anyhow).
>>
>> I'm ordering some 8 gauge wire, a 75amp relay, and an 80
>> amp automotive circuit breaker tomorrow. I'll use a
>> Derale adjustable fan controller to trigger the relay on at
>> 195 degrees (180 degree thermostat installed) or when the
>> A/C is on.
>>
>> We'll see how she fits...
>>
>> MattB
>>
>>
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