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OBD Fuse

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#1 mercon22


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Posted 22 January 2010 - 06:23 AM

My problem is the fuse that allows you to run a obd tester keeps blowing out...I went to get an inspection sticker and the test would not work because no signal was coming out of the port...so back to the shop I go...find a blown fuse..replace it and it works fine for about 2 mins..than the fuse snaps....now, I replace the fuse....and just sit there with the key on..no obd tester hooked up...just the new fuse and sure enough..two mins go by and SNAP!!...Any clues to this problem?

#2 miesk5


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Posted 14 February 2010 - 09:01 AM

Just saw your Q here...
Code Reader Will NOT Power up; 96 Bronco & all Ford; "Check fuse 16 (Bronco) for the cigarette lighter. It is shared with the OBDII connector power and is commonly blown" miesk5 note; our 96's lighter wiring shorted out @ ashtray support..."
Source: by miesk5
Posted Image
If no 12v, trace same wire from DLC connector pin 16 back and see if it is shorted on frame.
to power the DLC con up, run a jumper from 12v always on Source (fuse box, etc.) and tap into that pin 16 wire

If power is @ 16; then ck other pins for
Ground (chassis) @ pin 4-use a multimeter to ensure ground is good... make sure it is on OHMS Range before testing!
96 Bronco, E4OD, Man Xfer Case & Hubs
See my Big Bronco & F Series Technical & Parts LINKS site. Will need to clean up dead links & add many more new links some day. Thanks to Mr. Schwim! http://schwimserver5.com/?index=1128
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