Is 15 Volts at Voltmeter Too Much? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-09-2006, 04:23 PM
Member
 
Join Date: Aug 2002
Location: Fallon, NV
Posts: 180
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Is 15 Volts at Voltmeter Too Much?

I just took the Mustang on a 800 mile road trip, and I noticed an increase in the voltmeter reading as we got further into the trip. The fan fuse popped twice during the trip, and at the trip's end the engine lost all fire - no spark at all. We narrowed that problem down to the magnetic pick-up in the Duraspark distributor. What I'm getting to is that the voltage (per gauge) was reading 15+ volts after I had the fan problem. I'm wondering if that may also have been the cause of the distributor's demise. My understanding is 14.4 volts is max. For most of the trip the voltmeter read just over 14. The alternator is a 100 amp GM type (3-wire) that I modified to fit on the Mustang's 351W.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-09-2006, 04:58 PM
docvette's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Rebuild an alternator Last photo:
Join Date: Mar 2004
Location: Lafayette, california
Age: 62
Posts: 7,362
Wiki Edits: 12

Thanks: 0
Thanked 6 Times in 3 Posts
Doc here,

Without reading actual Battery voltage with a known accurate Volt meter (DVOM) you will not know what the output is..

14.4 is max output on a properly adjusted , functioning system..under no load.

On some panel gauges, the accuracy may be lacking..15 volts is close to 14.4..and it may only look like 15 volts.

Measure across the battery with it running , no load, 5 or so minutes after start up, (to replace the surface charge) and it should read between 13.96 and 14.4 volts ...If it's 15 or above..replace the regulator diodes (and the rectifier diodes as well..) Or the whole Alternator..(your choice..$15 bucks for the kit..)

If the diodes are bad...most likely you had raw AC in the Vehicle electrical damaging the electronic componets..(rectifier diodes)

You can get a free test at auto zombie..but Some of those "Guy's" aren't the sharpest crayons in the box..and have been known to "Misread" or screw the test up so check it with a meter first..

Doc
__________________
Aftermarket Solutions
Electronic & Electrical
Innovations
Reply With Quote Quick reply to this message

Recent Electrical posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
CB radio on 6 volt system Nightfire Electrical 19 04-25-2009 08:49 AM
Hey Barry, Hey Martin 15 degree rule AC/DC Body - Exterior 15 02-01-2006 08:13 AM
low profile tires for 15 inch Halibrand reps peranaman Suspension - Brakes - Steering 3 06-28-2005 04:36 AM
Por 15 as a Primer bjam2 Body - Exterior 13 11-27-2003 01:41 PM
halloweenking Por 15 paint? DeathByGreaser Body - Exterior 12 07-03-2003 03:50 AM


All times are GMT -6. The time now is 10:37 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.