ABS Blinking - No tail lights
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Junior User
Joined: Jan 2006
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ABS Blinking - No tail lights
I searched a lot, but can't seem to find the right solution. I have a 93 F150. The ABS light started flashing (15 times). After checking the site, I found others had brake light problems to. I checked mine and they weren't working. I checked the fuse and it was blown. I put a new one in and it popped. I started checking for shorts and I think I have convinced myself that the short isn't in the brake light switch, nor the hazzard switch. Now, I'm stuck. Any ideas?
Thx. in advance for the help.
Thx. in advance for the help.
Thread Starter
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Junior User
Joined: Jan 2006
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I have measured the ohms at the conn. on the brake light switch and hazard switch. The short doesn't appear to be there. Based on that, don't I need to do the same checks at the ABS conn. If I don't find the short in the ABS module, then I am assuming that I have short in the wiring between the conn's and the fuse box. Am I correct?
Thx.
Thx.
Elder User
Joined: Sep 2007
Posts: 624
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From: Kalamazoo, MI
you didn't do what was suggested...
pull the brakelight sockets apart, and any accessory wiring back there.. trailer harness, etc.
DO THAT FIRST.
YOUR ABS MODULE IS NOT THE PROBLEM.
pull the brakelight sockets apart, and any accessory wiring back there.. trailer harness, etc.
DO THAT FIRST.
YOUR ABS MODULE IS NOT THE PROBLEM.
Last edited by JLDickmon; Dec 16, 2007 at 10:33 AM.
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
quit making it so hard on yourself and do the easy things first.
the sockets are very easy to diagnose.
the sockets are very easy to diagnose.
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Junior User
Joined: Jan 2006
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OK. I thought I had ruled the trailer/brake lights out by checking for shorts with the brake light switch plugged in and un-plugged. Anyways, I did as suggested. I don't see any obvious corrosion, but I might not be looking at it correctly. I also removed the trailer wiring adapter and plugged it back directly. I put in a new fuse and it blew immediately. Am I suppposed to removed the cover to the brake light bulb sockets to check for corrosion? If so, how do you remove that socket cover?
Thx. again for the help.
Thx. again for the help.
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Elder User
Joined: Sep 2007
Posts: 624
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From: Kalamazoo, MI
OK...
here's where I'd like you to do some things in a specific order
pull the tail & brakelights out of their sockets
pull the trailer adapter & leave it disconnected
pull the connector off the brake light switch.
put a fuse in it.
if it doesn't blow, start hooking stuff up one thing at a time untill it does..
if the fuse DOES blow, disconnect the turn signal switch connector (the other flat connector on the lower part of the steering column)..
& put another fuse in it. I think we'll have isolated the problem by then.
here's where I'd like you to do some things in a specific order
pull the tail & brakelights out of their sockets
pull the trailer adapter & leave it disconnected
pull the connector off the brake light switch.
put a fuse in it.
if it doesn't blow, start hooking stuff up one thing at a time untill it does..
if the fuse DOES blow, disconnect the turn signal switch connector (the other flat connector on the lower part of the steering column)..
& put another fuse in it. I think we'll have isolated the problem by then.
Thread Starter
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Junior User
Joined: Jan 2006
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OK. I did as you suggested. Unfortunately, my fuse blew with all of this disconnected. Just for clarification. Is the turn signal switch conn. a little bigger than the brake light switch. The one I disconnected was directly below the steering column. It had two conn. tabs (one on each side). It was kind of hard to disconnect. If this is the right one, then none of this worked. What should I try next?
BTW.. Sorry for all the questions, but it's the only way that I can learn. If you disconnect the brake light switch doesn't that by default rule out everything downstream of that circuit (i.e. brake lights, trailer lights, etc.). This is what I was trying to ask earlier, but I don't think I was clear.
Thanks again for all the help. Maybe I can get this truck up and running again very soon.
BTW.. Sorry for all the questions, but it's the only way that I can learn. If you disconnect the brake light switch doesn't that by default rule out everything downstream of that circuit (i.e. brake lights, trailer lights, etc.). This is what I was trying to ask earlier, but I don't think I was clear.
Thanks again for all the help. Maybe I can get this truck up and running again very soon.
Posting Guru
Joined: Aug 2007
Posts: 2,026
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From: Belle Mead NJ
Try putting 12V to the brake light switch. If you have a power probe that will work nice. If that works right with the 12v going to the switch and ur lights work then its in the wire between the fuse and plug or on the other side of the fuse.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
I take it that it is Fuse #13 that is blowing on you.
My guess is your truck is about to burn, unhook the pressure switch on the front of the MC. Then get it to a Ford dealer and they will replace the switch and put on a small wiring harness on it for FREE.
My guess is your truck is about to burn, unhook the pressure switch on the front of the MC. Then get it to a Ford dealer and they will replace the switch and put on a small wiring harness on it for FREE.
Senior User
Joined: Jan 2007
Posts: 339
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Try THIS: Look under the hood, in the front of the master cylinder there is a pressure switch, see if its leaking fluid, or wet, pull the electrical connection, if its melted or messed up, cut the wires, and seperate them, then make sure they are not touching anything and try another fuse and see if this works, had the exact problem on a 94 and this is what we did, We left it disconnected and taped the ends everything worked fine for us. Let me know if this helps or not.
Hotshot
Joined: Jul 2003
Posts: 12,177
Likes: 40
From: Newport, WA
DON'T CUT ANY WIRES! If you suspect the pressure switch on the master cylinder, take the thing to Ford and they'll fix it for FREE- there was a recall issued. Did you totally miss subford's post just above aj197816134's?