Electrical advice PLEASE!!!!!!!!!

[Jasons68]

Imnot sure if this would be more suited for the coolong section, but here it goes. I havent heard anything from DCCONTROLS after a week and a half or so... so I am needing a method of hooking up my Taurus fan. The link below has what looks like a simple way to control a fan, but seems like the relays are a little weak for the taurus fan. My questions can I simply replace the 30amp relay included with a 75 amp relay and be done with it? Here is the link to what I am looking at:

http://cgi.ebay.com/ebaymotors/FAN-C...1%7C240%3A1318

PLEASE let me know if my idea will work or if I need to pony up $$$$$ for something like the Dakota Digital unit.

Thanks
Jason

[FULMNTE]

A 70/75 Amp relay has different size connectors, so the plastic connector might not fit...

[Jasons68]

CRAP! If I bought the higher amp relay and the "plastic thingy" does this appear to be a set-upthat would work and be reliable?

[FULMNTE]

The principle is correct, but all these parts in the kit are probably 30 Amps rated, including the circuit breaker

[MonzaRacer]

If you burn up 30 amp relays with cooling fans then the m otors are junk.
If it has dual fans simply use 2/ 30 amp relays from local carquest, simply crimp ,solder and shrink tube the connections (crimp terminals) going to it. They also do sell relay plugs but I usually just do my own wiresm then tape the hand made harness.
Feed a 30 amp maxi fuse to each relay you can tie the appropriate terminal (usuallu 85 or 86) to the hot wire AND to hot feed of the relay, then simply wire in the fan to the appropriate normally open or normally closed terminal and the ground for the relay pull in circuit to what ever you use to activate it.
I like either the adjustable units for fans or temp switchs.

[ProTouring442]

If you burn up 30 amp relays with cooling fans then the motors are junk.

Not necessarily, the Taurus and Mark VIII fans can draw upwards of 40 or 50 amps! These single fan units flow in the range of 4500 cfm, much more than the various aftermarket fans such as Spal, etc.

On my 2-speed Mark VIII fan I am running the low speed through the ECM with a 70 amp relay. The low speed will also kick in when the A/C pressure is high, through a second relay. High speed is controlled by a thermal switch on the engine, again through a 70 amp relay.

Shiny Side Up!
Bill

[Jasons68]

Thanks for the replies! I ended up buying the Dakota Digital unit. It says it is rated at 70 amps for one speed and you can purchase another relay for a dual speed. I will use as a one speed for now and upgrade later if needed. I am considering selling the car and didnt want the wiring to look half-a@#$. Besides, once you buy a couple of quality relays and a sening unit, the money saved didnt seem worth the hassle. And yes I did email dccontrols, but never got a response to an inquiry.

Anyone have any experience with these?

http://www.dakotadigital.com/index.c...641/prd641.htm

I will let you all know how it works out

[SamHatco]

Not necessarily, the Taurus and Mark VIII fans can draw upwards of 40 or 50 amps! These single fan units flow in the range of 4500 cfm, much more than the various aftermarket fans such as Spal, etc.

On my 2-speed Mark VIII fan I am running the low speed through the ECM with a 70 amp relay. The low speed will also kick in when the A/C pressure is high, through a second relay. High speed is controlled by a thermal switch on the engine, again through a 70 amp relay.

Shiny Side Up!
Bill

I hope this isn't considered thread hijacking. If it is, I am sorry.

Bill,

I have the 04 GTO wire harness and I am planning on using a 2 speed Mark VIII fan do you have any pictures of your setup? Schematics?

[ProTouring442]

I hope this isn't considered thread hijacking. If it is, I am sorry.

Bill,

I have the 04 GTO wire harness and I am planning on using a 2 speed Mark VIII fan do you have any pictures of your setup? Schematics?

I'll never be able to describe it.... I'll send a PM

Shiny Side Up!
Bill

[MonzaRacer]

Strange ihave yet to see any relay over 30 amps in Taurus boxes for the fans, Now you may get a spike near 40 amps but I just havent seen any fans running 40 amp relays in Fords, heck even the IRCM boxes still come from Ford only have 35 amp relays inside from the ones I have torn apart.
If you get that many amps pulling from relay it may require larger wiring. Thats not to say that they dont have some using 40 amp relays but in last 10 yrs I havent seen them,,,yet.
I just havent had any cooling system issues since using electric fans and my favorite has been the older Cav/Sunbird/Firenza fans.
Picked one up for my Big Block Monte and it kept it cool no problems and only had a 3 row core rad.

[ProTouring442]

Strange ihave yet to see any relay over 30 amps in Taurus boxes for the fans, Now you may get a spike near 40 amps but I just havent seen any fans running 40 amp relays in Fords, heck even the IRCM boxes still come from Ford only have 35 amp relays inside from the ones I have torn apart.
If you get that many amps pulling from relay it may require larger wiring. Thats not to say that they dont have some using 40 amp relays but in last 10 yrs I havent seen them,,,yet.
I just havent had any cooling system issues since using electric fans and my favorite has been the older Cav/Sunbird/Firenza fans.
Picked one up for my Big Block Monte and it kept it cool no problems and only had a 3 row core rad.

I've never really looked at a Mark VIII to see the relays, so I cannot comment, but I can tell you that the wiring is definitely heavier than what I have seen in GM stuff.

I've used 80s-90s Camaro units on small block powered cars, but with the 454 and A/C I wanted something that could really guarantee that the car would stay cool on a humid 100* Washington area summer day while sitting in the usual Washington area traffic. I don't know what sort of air flow the typical GM fan moves, but on high, the Mark VIII moves some 4000 or so cfm, and this is a single fan unit!

As for wiring and relays, experiance has taught me that overkill is never a bad thing. From running double-O gauge battery cables (back before gear reduction starters) to using relays on any decently high amperage circuit, I have found that going with the overkill means not having to fix something in the middle of nowhere.

Of course the other side of the equation, and one that few seem to think about, are the grounds required. I have seen more than one mechanic absolutely baffled by an electrical problem that was obviously a ground issue. My favorite was a mechanic who was trying to fix a '71 Olds Cutlass that came in because the fan would not work. While showing me how there was power getting to the fan, he accidentaly touched his testlight to the fan body and it lit. Unfortunately, he did not know that this was a clear indication that the fan motor was not grounded! Worse, in his quest to repair the vehicle, he had replaced the fan motor, the resistor pack, the fan switch, and the high-speed relay! His next step was to pull the dash and start tracing all the wires!

Shiny Side Up!
Bill

[CarlC]

To use a 70-amp relay drill a small hole in the high-amperage in/out blades. Use small screws and nuts to secure a crimp connector. I like to use a full-hoop type vs. the "U" style. It works fine and has more contact area than a blade.

[parsonsj]

It's a damned shame that DCControls has such poor communications with customers (or potential customers). I'm using his fan controller and it works flawlessly, including the A/C input.

I hope mine never fails!

jp

[Twentyover]

I use http://www.texasindustrialelectric.com/relays.asp 24106 to power my ignition switched FI and interior stuff