Register free!

The Green Industry's Resource Center



Reply
 
Thread Tools   Display Modes
  #1  
Old 07-06-2005, 11:06 PM
ArchZangel ArchZangel is offline
LawnSite Member
 
Join Date: May 2005
Location: Florida
Posts: 24
Electrical Diagnosis questions

For all u mechs out there. I worked on a Scag today. FH680V (23 Kaw) Came in for a "no crank problem" Turned out dead battery. Checked starting system. All good there. Checked charging system. Now if I am not mistaken. The regulator needs some voltage to work at all. Charged the battery and still showing nothing over 12.5. What I am asking is an affirmation of my diagnosis. I charged the battery enough to start the engine on its own. But yet it shows barely any charging. Low to high idle. 12.5-12.8 Put a new battery on and voila charges from 12.9-13.6 from low to high. A battery can be so dead that it takes no charge? Yet still had enough "surface" charge to start the engine? Oh it's maddening. OIh and get this it was a blown fuse that kept the battery from charging in the first place. I replaced it. i tested the mower for a while. When I was done, man that fuse starting melting already. Would dying electric clutch cause such draw, or ya'll think it just might be a crappy connector arcing? Sorry for all the questions but the whole thing is crazy.

ARA
Reply With Quote
  #2  
Old 07-06-2005, 11:56 PM
Restrorob's Avatar
Restrorob Restrorob is offline
LawnSite Fanatic
 
Join Date: Apr 2005
Location: Show'n my truck off !
Posts: 10,778
[QUOTE=ArchZangel]For all u mechs out there. I worked on a Scag today. FH680V (23 Kaw) Came in for a "no crank problem" Turned out dead battery. Checked starting system. All good there. Checked charging system. Now if I am not mistaken. The regulator needs some voltage to work at all. Charged the battery and still showing nothing over 12.5. What I am asking is an affirmation of my diagnosis. I charged the battery enough to start the engine on its own. But yet it shows barely any charging. Low to high idle. 12.5-12.8 Put a new battery on and voila charges from 12.9-13.6 from low to high. A battery can be so dead that it takes no charge? Yet still had enough "surface" charge to start the engine? Oh it's maddening. OIh and get this it was a blown fuse that kept the battery from charging in the first place. I replaced it. i tested the mower for a while. When I was done, man that fuse starting melting already. Would dying electric clutch cause such draw, or ya'll think it just might be a crappy connector arcing? Sorry for all the questions but the whole thing is crazy.

It is a possibility there is a shorted plate in the battery and you happen to have enough surface charge to start it up but it wouldn't show a charge.
The most common way to check a battery after charging is to let it sit for about 45 mins. then check it with a load tester.
It's possible the fuse holder is causing the fuse to get hot and thats a cheep replacement so I would change that first and re-test the unit.
If this unit has the adjustable clutch I would check it and adjust to .012" ,If not look for a clutch going out causing the fuse to get hot.
__________________
Quote:
Originally Posted by piston slapper View Post
You never learn anything until you admit you don't know it all...
Quote:
Originally Posted by MannsLawnService View Post
some times the man in my mirror isn't so smart...
"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
Reply With Quote
  #3  
Old 07-07-2005, 01:19 AM
khouse khouse is offline
LawnSite Bronze Member
 
Join Date: Feb 2001
Location: lee's summit, mo
Posts: 1,479
Anything over 12.6 is charging the battery so your readings after the new battery sounds good. I don't know about the fuse getting hot except a high resistance connection at the fuse holder itself. Does the fuse get hot when the clutch is disengaged?
Reply With Quote
  #4  
Old 07-07-2005, 03:41 PM
ArchZangel ArchZangel is offline
LawnSite Member
 
Join Date: May 2005
Location: Florida
Posts: 24
Ahh

Thanks for the respose guys. The owner took the machine back. He just "Had" to have it back. So I never checked to really see if the fuse got hot without the blades engaed. I did get to run it for 5 min without the clutch on and I felt no difference, still darn hot!. I gave him some fuses. I expect to see him back soon. The other fuse was slightly melted too, but not open though. The fuse holder replacement. Never thought they could cause that much heat. I was always like they do or do not work. Yes the clutch is adjustable. He did adjust it because he said it was slipping. I seriously doubt he has the required .012 clearence. Well thanks again gentlemen. Nice to meet u all!

ARA
Reply With Quote
  #5  
Old 07-07-2005, 06:17 PM
Redneckn's Avatar
Redneckn Redneckn is offline
LawnSite Senior Member
 
Join Date: May 2005
Location: Round Rock Texas
Posts: 294
I have never felt like anything less than 13vdc was "charging". Also, I have had batteries that had a nice to look at voltage reading, but didnt have crap for amperage.
Electrical problems are fun. I enjoy messing with that type of thing on a machine.
__________________
As a former fetus, I oppose abortion.

Board Certified Redneck.
Reply With Quote
Reply

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





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 11:24 AM.

Page generated in 0.07783 seconds with 9 queries