Power Problem

[maro2nv]

I have a one wire 140 amp alternator and the ron davis duel electric fan setup and a crane hi-6 ignition box, thats it. When my fans turn on my idle drops till they turn off. The weird thing is that my volts are at 14 the whole time. The fans have a reley per fan. I have tried everything and cannot figure it out. I have plenty of grounds and have done ohm testing on them, there all good connections. What else can i do. Thanks

Josh

[MonzaRacer]

OK which alt is it and what do you mean by one wire?
If its a CS style alt it has to at least have a key on wire or the stupid thing wont make a lot of power. Seen several sold as one wire and they have issues.
First if its a CS series (the newer 90s style GM alts) the S term needs to swing over to the battery post and the F terminal goes to 12v key on.
Oh and you need to make sure your battery output wire is making a good connection to a point that goes directly to the battery(or directly to the battery positive).
And if it is a older SI series then you hook it up the same way S terminal is Stator and f terminal is field ,,,field always gets key on power. and s terminals get battery power.

[maro2nv]

The alternator is from kragen, its there polished one. I asked them if they had any info on it but the couldnt tell me anything. By one wire i mean it just has one wire off the back of the alternator to the pos on the battery. With the fans on at idle anything below 900 rpms the volts start to drop. I have the march surp pulley kit on it but i upgraded the alternator pulley to a smaller one.

[6'9"Witha69]

That is a very poor alt. One wires suck for street cars with accessories. Ignition boxes are very picky about full voltage. Look here for a good explanation about why One wires do not work
http://www.madelectrical.com/electri...hreewire.shtml

[maro2nv]

Thanks for the link. What is a good 140 amp 3 wire alternator to buy. Also how do you hook up the 3 wire Alternator. Where do the other 2 wires go?

[BonzoHansen]

See the above mad link for the info you seek.

[6'9"Witha69]

The main tech page
http://www.madelectrical.com/electrical-tech.shtml
has all you need in a variety of ways.

I also highly suggest:
http://www.madelectrical.com/electri...esensing.shtml
http://www.madelectrical.com/electri...elcoremy.shtml
http://www.madelectrical.com/electri...witworks.shtml
http://www.madelectrical.com/electri...evymain1.shtml
Add a good one to consider while you are at it.
http://www.madelectrical.com/electri...adlights.shtml

BTW, I have done these exact mods to my car and love the results. AS PROMISED.

[maro2nv]

Thank you for the links. I just got my wisdom teeth out so i had the time to read them all. I dont have a horn reley. I have the painless wiring kit for the 68 camaro with the high amp alternator kit. The wire from the alternator goes to A 80 amp maxi fuse, then to the starter and then to the battery. The fans and the ignition are ran off the battery. So i am going to buy the insulated terminal block from M.A.D. and run all the acc off that. Also i am going to buy the reley kit for the headlights. What Alternator company do you guys recommend. I would like a 140 amp 3 wire. I have a pretty big stereo so thats the reason for the 140 amp.

[6'9"Witha69]

Where are you located?

This is my buddies dad's shop. Check it out. They do great work and can do powder coated cases and such if you want.

http://www.qualitypowerauto.com/

[maro2nv]

Im located in sacramento ca

[6'9"Witha69]

They ship.

[maro2nv]

Thanks i will give them a call.

[MuscleRodz]

The underdrive pulley on your alternator isn't helping. Put the larger pulley back on it.

Mike

[maro2nv]

I have stock size crank and waterpump pulleys just bought a tiny bit smaller alternator pulley to make it spin a little faster at idle.