Well, I under took my project today and finished the install of all the parts. I have a Mark VIII fan and I am trying to find were to plug it into. I have a test light and couldnt get it to light up even with ACC mode with all the wires in the engine bay. I added a 100amp alternator. So I ran a wire from my fuse box (Radio) witch I knew ran in ACC and was 12V. Tested the wire with the Test light and it light up bright. So I hooked it all up and it blew a fuse. Any ideas?
Spent all day working on my car and LOVE to get this finished.
Thanks,
Jon

Electric fans draw much more current that ACC fuses and wiring would handle. That's why the fuse is blowing. Hopefully someone on here can help with where to find a suitable power point.

you need to use a relay to power the fan
this drawing i did a while back should help, if you dont want to use a temp sensor and just want the fans on anytime, ground that wire

http://i32.photobucket.com/albums/d16/bastereo/fanwiring.jpg

Thanks 400 bird.
So is the 70amp Relay the best? I have a relay in the car now but I think it burned up. Is that possible? It has about 5 wires coming out of it. Is there anything else that maybe wired into the relay? I used a test light on it and it does not light up in ACC or running.
Jon

Few more questions on your drawing.

Fan + (I know where that goes)
Bolt + [Fuse] (Where does this wire go to)
Ing + (Where do I find the ING wire)
Temp Sensor (I think I can figure this one out)

Sorry to sound like a newbie but I am when it comes to electronics.

Jon

-the "batt" (not bolt, but thats probably what you meant) can go to the battery itself, or the horn relay has a buss on it that has battery power. be sure to put a fuse in line, before the relay.
-the "ign" (not ing. but.... see above) goes to a source that is on when the car ignition is on, and off when its off. a good source is one of the terminals at the fuse box labeled "ign". just test with a tester, you'll find one.
don't worry about asking, none of us were born knowing these things :thumbsup:

68rs has it right, and i never even noticed the typo for ign...

and the temp sensor should not be the one that is already in the motor(for the gauges or idiot light), you need to get one for an electric fan

go to summit and search for "electric fan sending units"
just pick one for what temp you want to fan to cycle on and off at

and i dont know what that relay is for, maybe power windows, power top, horn relay, some aftermarket add on, dont know without a discription...

i got my relay from autozone, i think, but i had to order it online

and dont worry about the questions, i had to be taught all this stuff too

YOU GUYS ROCK....

Thanks so much, I finished my car today and took it out for a long drive. It was flawless. Never touched 200 the entire time (Even heavy traffic) This was the FIRST time I drove the car since I bought it without a problem.

I think I toasted my alternator though. I need to jump the car when I start it. When I first hooked up the fan I used the red wire right off the alternator. My amp guage in the car shows 0 amps all the time. I guess thats the price of learning but it was worth it.

Thanks again guys.
Jon

Not sure what alternator you'll need, but a stock one won't keep up with the fan and other accessories. You'll need something like a CS130.

glad to here you had a great drive

you should not use the wire on the alternator, the huge spike when the fan turns on may be harmful to your alternator

if you are going to upgrade your alternator, look for an internal regulated, 100amp or more alternator, i have a power master and have been happy with it, got it from summit

and i would recomend getting a voltage gauge (not amp gauge), so you can know how the alternator is actualy working, but the amp gauge is better than nothing

let us know if we can help any more

You need to wire the fan directly to the battery via a powered relay. The relay can be activated by any point that is ignition fused. Painless Wiring and Flex-A-Lite both sell pretty good kits that come with instructions on how to wire up the fan.

Good Luck :D

I'll say it should go to the point of power distribution, probably the horn relay, but I ran the one on my 82 to the battery with no problems.

http://www.madelectrical.com/index.shtml