4 post Isolator

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=58136
Printed Date: May 15, 2025 at 9:03 AM

Topic: 4 post Isolator

Posted By: gavin9797
Subject: 4 post Isolator
Date Posted: June 21, 2005 at 12:02 PM

I have a four post 240 amp isolator....with no instructions. Everything is fairly straight forward with it, But I am not exactly sure what the 4th post labeled "E" is for. What is this post for and do I need to connect it for the isolator to be functional?

Thank you for your replies.

Replies:

Posted By: haemphyst
Date Posted: June 21, 2005 at 12:16 PM

If I am not mistaken, the fourth post is for older style Ford/GM alternators that had an external field winding exciter, or something like that... What does you install manual say?

-------------
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Posted By: Ween
Date Posted: June 21, 2005 at 7:40 PM

hi,

i have an old instruction manual for a phoenix gold isolator. it shows the "E" terminal used on GM/Delco equipped vehicles, when the alternator is of the "CS" series....1985 and later. it shows the "E" terminal connected to an ignition hot through a 10A circuit breaker. depending upon your vehicle/alternator, it may not be necessary. hope this helps.

mark

Print Page | Close Window