Alternator WOT switch? - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Focus Fanatics > Ford Focus Tech Discussions > Focus Tuning Chat

Focus Tuning Chat Discuss performance tuning options for your Ford Focus.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 09-22-2012, 04:20 PM   #1
iminhell
C2H5OH
 
iminhell's Avatar
 
Join Date: Jun 2006
Fan#: 36222
Location: Darwin, MN
What I Drive: 2000 & 2001 ZX3's

Posts: 10,501
FF Reputation: 48 iminhell Great Standing Member
Buy-Sell-Trade Rating: (4)
Alternator WOT switch?

Has anyone ever run into an issue where you can't disable the switch? (alternator cuts out at WOT even though you're commanding it to stay on)


Actually everything I tell the alternator to do isn't working quite right.
I'm telling the alternator to charge at 14.1 volts all the time. At idle with no accessories on it charges at 14 volts. When I turn the headlights on it drops to ~13.8-13.9 volts.
I replaced the wire from the alternator to the starter and from the starter to the battery the other day; larger gauge and known good wire/connectors. Voltage gained 0.1 volt from doing this; to where I'm at currently above.
The connector on the voltage regulator looks to be perfect. Wires aren't damaged or even stretched. Though it is the most likely culprit I can't find it to be bad.

Problems start around the 4,000 rpm mark, sometimes at part throttle and almost always at WOT.
I've adjusted the tune in various directions with no changes at all.

I'm curious if logging the alternator 'generator duty cycle' may shed any light on my issue? As in if it's near 100% most all the time the alternator is on the way out?

I'm at a loss here. Just tooteling around like a normal car everythings just fine. It's only when the car is pushed that this happens.


__________________
Don't "think outside the box".
There is no box.
Do it correct, or do it twice.
iminhell is offline  
    Reply With Quote
Sponsored Links
Advertisement
 
Old 09-23-2012, 09:38 AM   #2
1turbofocus
FF Affiliate
 
1turbofocus's Avatar
 
Join Date: Oct 2003
Fan#: 1123
Location: Belmont, NC
What I Drive: 2000 ZX3 / 2002 SVT Turbocharged

Posts: 21,778
FF Reputation: 153 1turbofocus Excellent Standing Member 1turbofocus Excellent Standing Member
Buy-Sell-Trade Rating: (28)
What happens ? Normal charging systems is 13.6 to 14.2 so if your holding a 13.8 to 13.9 then your right where you should be

Keep in mind your voltage is going to the Batt , at the Alt you may see it doing the 14.1 but at the batt ( Batt hooked up ) it will always be lower

Tom
__________________
Focus-Power: Your #1 Source for Ford Focus Speed, Tuning & Performance!

Customer Support
AIM: hpdyno
Email: hpdyno@aol.com
Phone: 704-249-3745
Site: focus-power.com

Elder 1turbofocus
1turbofocus is online now  
    Reply With Quote
Old 09-23-2012, 03:32 PM   #3
iminhell
C2H5OH
 
iminhell's Avatar
 
Join Date: Jun 2006
Fan#: 36222
Location: Darwin, MN
What I Drive: 2000 & 2001 ZX3's

Posts: 10,501
FF Reputation: 48 iminhell Great Standing Member
Buy-Sell-Trade Rating: (4)
These are voltage minimums:




It's very noticeable when it bottoms out. The dash lights dim a lot and a few times the headlights have turned off (Mach HID's).

I logged generator duty cycle last night but I've no clue if it shows anything useful. I had expected it to be a percentage much like injectors PW or fuel pump duty cycle, it wasn't. Most of the time it just read zeros. But near the times voltage was dropping it would register numbers; .3-.6 generally and only for a very short time. So I'm not sure if it even logs correctly.
Also the genDC and low voltage don't always correlate, actually the DC reads zeros more times than it registers working.

Here is the log (it's long, ~45 minutes) --> http://www.sendspace.com/file/2kvf2o
Here is the tune file --> http://www.sendspace.com/file/r4o7by
__________________
Don't "think outside the box".
There is no box.
Do it correct, or do it twice.
iminhell is offline  
    Reply With Quote
Old 09-23-2012, 05:28 PM   #4
badazz2010focus
Focus Fanatic
 
Join Date: Aug 2010
Fan#: 78166
Location: jupiter, FL
What I Drive: 2010 ingot silver 2 dr 5 speed

Posts: 4,084
FF Reputation: 7 badazz2010focus Good Standing Member
Buy-Sell-Trade Rating: (0)
voltage regulator? LOL somethings you cant over ride I dont think.
badazz2010focus is offline  
    Reply With Quote
Old 09-23-2012, 09:28 PM   #5
bespurcell
Focus Addict
 
bespurcell's Avatar
 
Join Date: Nov 2008
Fan#: 60917
Location: Purcell, OK
What I Drive: 2003 black svt

Posts: 716
FF Reputation: 2 bespurcell Good Standing Member
Buy-Sell-Trade Rating: (0)
I have to agree with that^^. At idle the voltage regulator is only going to be able to do just so much.
__________________
Dominant Eng. orp, ITG Maxogen panel filter, Focus-Power tune, Team Dynamic Pro Race 2 16x7 wheels in black(36 lb weight reduction from stock tire/wheel combo)
bespurcell is offline  
    Reply With Quote
Old 10-17-2012, 11:27 PM   #6
iminhell
C2H5OH
 
iminhell's Avatar
 
Join Date: Jun 2006
Fan#: 36222
Location: Darwin, MN
What I Drive: 2000 & 2001 ZX3's

Posts: 10,501
FF Reputation: 48 iminhell Great Standing Member
Buy-Sell-Trade Rating: (4)
Got it solved.

You'll never guess what it was either.

OK. So I replaced the positive battery cable, improved the grounds and checked all the wiring. Same issue, though voltage was more stable. It still cut out WOT high RPM.
For some reason I played with the gauge cluster and ended up finding out somethings wrong with it. I swapped in the cluster from the other car and it works perfect. So the gauge cluster didn't dim anymore. The headlights still did though and logs showed a big voltage drop under the same conditions.

So today I'm going over what I can change in the tune and I come across something for the high speed fan under high load. I never noticed it before.
So I figure WTH, I'll adjust everything up and see what happens. High enough that it shouldn't kick in under heavy load ever.

And now voltage is good across the board. Weird.

I do think the alternator is a bit weak though. But this should prolong it somewhat.
__________________
Don't "think outside the box".
There is no box.
Do it correct, or do it twice.
iminhell is offline  
    Reply With Quote
Old 02-05-2014, 06:45 PM   #7
El Gato
Focus Rookie
 
El Gato's Avatar
 
Join Date: Feb 2014
Fan#: 139697
Location: Lexington, MA
What I Drive: 2002 Charcoal ZX5

Posts: 4
FF Reputation: 1 El Gato Good Standing Member
Buy-Sell-Trade Rating: (0)
With regard to your 9/23 post about logging the generator duty cycle, I am currently looking at similar data. Most of the time it reads zeros, but spikes when anything increases load (headlights, power windows, applying brakes, etc). For me, we see the headlights pulse/dim a few times within a few seconds in parallel with the generator duty cycle. We've been troubleshooting alternator-related issues (new battery, new alternator, new connector soldered in). Did you ever get feedback about using the generator duty cycle as a tool for troubleshooting?
El Gato is offline  
    Reply With Quote
Reply

Bookmarks & Social Networks
-->
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -5. The time now is 09:13 AM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.