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

[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