Light weight battery issue? - Ford Mustang Forums : Corral.net Mustang Forum
 
LinkBack Thread Tools Display Modes
post #1 of 1 Old 06-30-2017, 02:21 PM Thread Starter
Registered User
 
Trader Feedback: (10)
Join Date: Jan 2004
Location: Minnesota
Posts: 3,425
Light weight battery issue?

I've been running an Odyssey PC680 (mounted passenger side due to turbo) on my turbo 2v. Starts the engine no problem. Only non-stock acc the car has is 3 Ford GT fuel pumps (running full time) and a BAP.

The problem I've been experiencing is a low charge voltage. I am using a Motorcraft reman'd alternator (130 amp) that I bought directly from Ford.

I am running underdrive pulleys if that makes a difference.

Here is what I see for voltages @ battery:

Cold start: 13.8 (DVOM)

Warm idle: 13.4 (DVOM)

WOT: 12.0 (via live link)

Voltage does not increase when I rev the engine. It is basically a static value.

I installed a brand new PC680 last night to see if that was the issue, results are the same.

I have checked the resistance for the alt charging wire and the comes within spec.

12v excite wire is intact and produces battery voltage when measured.

I have an overdrive pulley to install on the alt, but figured revving the engine should at least bring up the voltage, which it does not.

I've thought about going to a larger 200 amp unit with upgraded power and ground cables to see if that helps, but that is a $400 gamble at this point.

Any thoughts? I'm kind of stumped at this one and would rather not just toss money at it to figure out WTF is going on.

Thanks!

Tim


'91 GT: SOLD

'04 GT: Forged bottom end, MHS Stg 3 PI heads, Hi-Tech Custom Cams, MHS Vic Jr + elbow, custom turbo kit, Precision 7175, T-56 & 3.27's. 785rwhp/725rwtq @ 20 psi.
Macs Stang is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forums : Corral.net Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Battery warning light macuser27 GT & SOHC 9 05-03-2017 06:07 PM
battery light ugymuggy Electrical & Wiring 2 04-02-2013 11:57 PM
Battery Light On-Please Help jlehma13 Electrical & Wiring 6 04-15-2012 05:28 PM
Battery Light Nightmare Wreckless Hype Electrical & Wiring 3 11-18-2011 11:00 PM
New battery tester Gary L Lounge 7 04-11-2011 11:22 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome