General Maintenance & Repairs Leaks | Squeaks | Clunks | Rattles | Grinds

Best way to find a short?

Thread Tools
 
Search this Thread
 
Old 07-23-2010, 10:53 PM
  #1  
TECH Resident
Thread Starter
iTrader: (10)
 
Adam86's Avatar
 
Join Date: May 2008
Location: Faribault, MN
Posts: 882
Likes: 0
Received 0 Likes on 0 Posts
Default Best way to find a short?

This car is quickly becoming a nightmare.

It keeps blowing the 50 amp ignition fuse. Have been tracing wires and have been coming up empty handed. When I turn the key on with a new fuse in, the gauges will light up and the stereo will come on and everything. But when I turn the key to fire up the ignition, the fuse immediately blows.
I'm 99.99% sure there is a wire grounding out somewhere in the system, just not exactly sure where. Anyone have some ideas? I would think it has something to do with the starter since the fuse only blows once I try to turn it over.

This is becoming sucky very fast.
Old 07-23-2010, 11:29 PM
  #2  
TECH Addict
 
fleetmgr's Avatar
 
Join Date: Jun 2009
Location: Tulsa, OK
Posts: 2,012
Likes: 0
Received 0 Likes on 0 Posts
Default

Well, the expensive option is a "short finder" off the Snap-On or Matco truck. Saved my bacon a time or two. The cheap option is to put a paper clip where the fuse goes, and then look for the smoke (if you think it's sucky now, try this!), IDK what the middle ground is.
Old 07-23-2010, 11:37 PM
  #3  
TECH Fanatic
iTrader: (10)
 
eseibel67's Avatar
 
Join Date: Feb 2008
Location: Kitchener, ON
Posts: 1,780
Likes: 0
Received 4 Likes on 4 Posts

Default

Disconnect the pos battery cable, and try to find continuity between the neg bat post and the suspect wires.
Attached Files
File Type: pdf
Starting.pdf (66.2 KB, 109 views)
Old 07-24-2010, 08:36 AM
  #4  
Save the manuals!
iTrader: (5)
 
wssix99's Avatar
 
Join Date: Dec 2007
Location: Chicago, IL
Posts: 12,755
Received 354 Likes on 323 Posts

Default

I'd try disconnecting the starter and then turn the key. If it doesn't blow then you'l know if it's the starter.
Old 07-28-2010, 10:17 AM
  #5  
TECH Resident
Thread Starter
iTrader: (10)
 
Adam86's Avatar
 
Join Date: May 2008
Location: Faribault, MN
Posts: 882
Likes: 0
Received 0 Likes on 0 Posts
Default

Finally actually got UNDER the car yesterday and found the thing. A wire going to the starter had melted because it was too close to the headers. Replaced it and will be heat wrapping it and tying it away from the headers.
The power wire was actually somewhat close to getting fried as well. That could have been pretty bad...




All times are GMT -5. The time now is 12:47 PM.