the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

loosing a volt at idle


Post ReplyPost New Topic
< Prev Topic Next Topic >
jdugan4859 
Member - Posts: 16
Member spacespace
Joined: December 03, 2005
Location: United States
Posted: August 18, 2007 at 9:55 PM / IP Logged  
I have a 2002 Ford Ranger "Tremor" I had a Mr. Alternator 200 amp after market alternator, that replaced the stock 120 amp alternator, the Tremors have an upgraded alternator because of the hugemongus stereo system, thats a joke btw, but they do have an upgraded alternator.
I have been having a problem where every time I come to a stop at night, my lights will dim way down, and the interior dash lights will dim so far down they appear to be off. Today we did some messing with it and checked the voltage. At idle, with no extra load, we are getting about 13 volts, down to 12.5 volts. With the light, and the electric fan on, it drops to about 11.9 volts at idle.
We took the after market alternator off and put the stock one back one. At idle now with no load it was pushing out 14 volts, with a load it was at 13.5 volts.
We swapped the Mr. Alternator back in, and it did the same thing as before, so we went back to stock, and now the stock one does the same thing as the Mr. Alternator. We unbolted the alternator and tried to change its position thinking that had something to do with it, to no avail.
There is no radio in this truck right now, the only loads were the lights and the colling fan.
Any ideas on what to cheeck.
jc18750 
Copper - Posts: 113
Copper spacespace
Joined: July 21, 2004
Location: United States
Posted: August 20, 2007 at 11:33 AM / IP Logged  
check your battery connections, the ground on the alternator, the tension on the alternator, and is the pully on the new alternator smaller?
My buddy had this problem and it turned out that he didn't put it on right and there wasn't enough tension on the belt so it wasn't spinning fast enough.
jdugan4859 
Member - Posts: 16
Member spacespace
Joined: December 03, 2005
Location: United States
Posted: August 20, 2007 at 10:02 PM / IP Logged  
We took the alt off, cleaned the contacts for the ground, and started it back up. Got 14 volts right off the bat. Started it up later, and were back down to 12.5 volts.
Unhooked the ground side of the battery cable with it running, and tested it to the end of the wire, away from the battery, back to 14 volts, touch the terminal to the battery, back to 12.5 volts. It is an Optima red top, and there must be something wrong with it, making it draw voltage down. Going to toss in another battery tomorrow and see what happens then.
docsautomotive 
Copper - Posts: 66
Copper spacespace
Joined: May 07, 2006
Location: Louisiana, United States
Posted: August 22, 2007 at 11:12 PM / IP Logged  

i would first take off the alternator to a shop that can test it wright the start checking yourself

23 yr auto tech saying this   i[f you dont know you can blow]

never stop

Sorry, you can NOT post a reply.
This topic is closed.

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Thursday, March 28, 2024 • Copyright © 1999-2024 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer