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Lars(wi) View Drop Down
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Joined: 14 Sep 2009
Location: Permian Basin
Points: 8042 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lars(wi) Quote  Post ReplyReply Direct Link To This Post Topic: Anti lock
    Posted: 17 hours 44 minutes ago at 9:32pm
brakes on ‘91 Ford F-350, the RABS module to be more specific. What is the proper way to ‘test’ that module?
The rear sensor on the differential shows 1600(ish) ohms, from I been told, that is acceptable?
So far, have not found the cause of the ‘Rear Antilock’ light constantly being on. If it went for the cruise control unable to activate, due to this particular warning light, I wouldn’t worry, but no cruise cuts into the mpg.
I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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fjdrill View Drop Down
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Joined: 13 May 2012
Location: Alabama
Points: 369 		Post Options Post Options   Thanks (0) Thanks(0)   Quote fjdrill Quote  Post ReplyReply Direct Link To This Post Posted: 9 hours 2 minutes ago at 6:14am
Check Third cab roof Brake light. The cruise current runs thru that circuit--it's goofy, replaced two light bulbs there and CC resumed working. LED bulbs in that location will not work.
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jaybmiller View Drop Down
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 24662 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 8 hours 42 minutes ago at 6:34am
Are you saying you have 'no cruise control'  ?
 If so ,was your truck recalled due to the 'master cylinder fire' problem and was 'fixed' by Ford ?
If so, then the fuse in the  'repair' has blown as the switch in the master cylinder has shorted to ground .
there is an EASY true fix to that problem that gives you back cruise control.
3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water
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Lars(wi) View Drop Down
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Joined: 14 Sep 2009
Location: Permian Basin
Points: 8042 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lars(wi) Quote  Post ReplyReply Direct Link To This Post Posted: 6 hours 54 minutes ago at 8:22am
Originally posted by fjdrill fjdrill wrote:

Check Third cab roof Brake light. The cruise current runs thru that circuit--it's goofy, replaced two light bulbs there and CC resumed working. LED bulbs in that location will not work.

Didn’t know that. I will have to check it out. This truck has a topper on it, with no 3 rd light.
I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Lars(wi) View Drop Down
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Joined: 14 Sep 2009
Location: Permian Basin
Points: 8042 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lars(wi) Quote  Post ReplyReply Direct Link To This Post Posted: 6 hours 35 minutes ago at 8:41am
Originally posted by jaybmiller jaybmiller wrote:

Are you saying you have 'no cruise control'  ?
 If so ,was your truck recalled due to the 'master cylinder fire' problem and was 'fixed' by Ford ?
If so, then the fuse in the  'repair' has blown as the switch in the master cylinder has shorted to ground .
there is an EASY true fix to that problem that gives you back cruise control.

Thanks Jay, don’t know if this vehicle went thru any recall repairs. It appears the Master Cylinder is not original, wheather it was replaced by Ford or not, I don’t know. The fuse in the fuse panel(position #17) is good. Is there another fuse in this particular system?

Edited by Lars(wi) - 6 hours 16 minutes ago at 9:00am
I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Lars(wi) View Drop Down
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Joined: 14 Sep 2009
Location: Permian Basin
Points: 8042 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lars(wi) Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 9 minutes ago at 11:07am
Originally posted by Lars(wi) Lars(wi) wrote:

Originally posted by fjdrill fjdrill wrote:

Check Third cab roof Brake light. The cruise current runs thru that circuit--it's goofy, replaced two light bulbs there and CC resumed working. LED bulbs in that location will not work.

Didn’t know that. I will have to check it out. This truck has a topper on it, with no 3 rd light.

After further research, ‘91 F-350 was not equipped with the ‘3rd light’. That is the ‘cargo light’ that illuminates the bed.
I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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fjdrill View Drop Down
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Joined: 13 May 2012
Location: Alabama
Points: 369 		Post Options Post Options   Thanks (0) Thanks(0)   Quote fjdrill Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 25 minutes ago at 1:51pm
Yep! my bad. was thinking 3 Brake light was 91. It came in 94. They have given me grief till I figured them out. Actually, a buddy told me about it, and I thought he was nuts! 
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jaybmiller View Drop Down
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Joined: 12 Sep 2009
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Points: 24662 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaybmiller Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 18 minutes ago at 1:58pm
My '97 was one of the ones with the 'flaming master cylinder' along with a long list of cars and other pickups. For that recall , Ford installed a small wiring 'harness' with an inline fuse. When that pops, no more cruise control ! Saves burning the truck toy  the ground( neighbours did is 10 minutes ! . Ned to see the wiring diagram, but for mine there's a 24/7 connection to the battery feeding the master cylinder switch that then powers the cruise control 'computer'. Dang silly 'engineering' and NOT needed....
3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water
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