Browne Posted May 20, 2008 Author Report Share Posted May 20, 2008 Can a BAD Fan Belt cause low voltage on idle? Quote System specs Beyma Pro 8MI (2) Rockford P550.2 Rockford T20001BD MTX 9512 (2) HO Alt 200amp BIG 3 Pioneer AVH-P4900DVD Clarion EQS746 AudioControl EPIC160 Kinetik HC2400 Link to comment Share on other sites More sharing options...
missinglink Posted May 20, 2008 Report Share Posted May 20, 2008 jeep Ok, what year & model of Jeep? Many Chrysler / Jeep / Dodge vehicles use the PCM to control voltage, and they tend to undercharge, especially at higher temperatures. 'Link Quote missinglinkaudio The United States Marine Corps. When it absolutely, positively has to be destroyed overnight - even if "it" belongs to the base commander... Link to comment Share on other sites More sharing options...
Browne Posted May 20, 2008 Author Report Share Posted May 20, 2008 Its Actually a 2004 Ford Explorer Quote System specs Beyma Pro 8MI (2) Rockford P550.2 Rockford T20001BD MTX 9512 (2) HO Alt 200amp BIG 3 Pioneer AVH-P4900DVD Clarion EQS746 AudioControl EPIC160 Kinetik HC2400 Link to comment Share on other sites More sharing options...
missinglink Posted May 20, 2008 Report Share Posted May 20, 2008 Its Actually a 2004 Ford Explorer Your alternator / regulator is not doing well. Perhaps a blown diode, or a regulator / brush problem. You could have one of four alternators, depending on engine size & Ford's mood that week. Both the 3G & 4G were used on both engines. If you have a 3G, there is a built in self-test on the back of the alternator. A ground jumper in the right place will force it to full output. This test should only be done long enough to verify a voltage increase - and only at idle. If it pulls up to 15 or 16 volts @ full output, your regulator or brushes may be bad. Easy fix, 4 torx screws. Once the regulator is out, have a look at the brushes. If the self test does not produce an increase in charging, you have an open diode or two. The alternator will have to be repaired or replaced. If you have the 4G alternator (black tin cover on the back) you will have to remove it to have it tested. Or drive the vehicle to autozone/pepboyz/kragen/checker etc. and have it "tested". Just write down the results & post them. 'Link Quote missinglinkaudio The United States Marine Corps. When it absolutely, positively has to be destroyed overnight - even if "it" belongs to the base commander... Link to comment Share on other sites More sharing options...
Browne Posted May 22, 2008 Author Report Share Posted May 22, 2008 Can it be that the output on idle is just very low? that what the alt say's its giving? Quote System specs Beyma Pro 8MI (2) Rockford P550.2 Rockford T20001BD MTX 9512 (2) HO Alt 200amp BIG 3 Pioneer AVH-P4900DVD Clarion EQS746 AudioControl EPIC160 Kinetik HC2400 Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.