Strange! New vehicle speed sensor and wire harness - Diesel Forum - TheDieselStop.com
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post #1 of 9 (permalink) Old 11-04-2018, 05:16 PM Thread Starter
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Strange! New vehicle speed sensor and wire harness

Got a strange one here. My 7.3's speedo started bouncing around about 6 months ago, mainly when I hit a bump. Then stopped working altogether. Occassionally would come back on but bounce once again. I replaced my VSS and wiring harness on the rear differential. I butt spliced the harness to existing wiring. No dice, speedo still didn't work so I thought it was something else. Been dealing with this for 6 months determined to figure it out. I finally figured out (light bulb went on!!) that when the truck got wet the speedo worked...(Desert rain occasionally and washing it). Turns out that when the butt splice itself gets wet, not the sensor, the speedo works perfectly. Once it dries out, speedo stops working again. I dump a cup of water on the splice and speedo works yet again. I used heavy duty butt splices. Is there a resistance issue or something similiar going on that the water fixes?

Thanks

Jared
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post #2 of 9 (permalink) Old 11-04-2018, 08:10 PM
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I'd get rid of the but splices and use solder and heat shrink to seal it up. There is a vendor that sells the connector for the VSS with a short pigtail. I know I have one sitting in my tool box waiting for me to get off of my duff and put it in. I also had a problem with the VSS that I just got solved.

Or you could rig up a drip can of water above the connection and have it drip on the connection as you drive. But refilling the can could be a problem every now and then.

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post #3 of 9 (permalink) Old 11-04-2018, 09:10 PM
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Originally Posted by JJEdwards View Post
I butt spliced the harness to existing wiring.
When I read this line I knew this was going to be your problem before you even described your problem. NEVER use butt splices, they cause far more problems than they fix. Solder and shrink tubing is the only effective way to splice wires.

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post #4 of 9 (permalink) Old 11-04-2018, 09:42 PM
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Quote:
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I used heavy duty butt splices.
Try normal ones, but crimp them the way this shows:


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...butt splices, they cause far more problems than they fix.
I'd say that about ScotchLoks, but I use butt crimps all the time, and have very few problems from them. Maybe 2 failures in the past 25 years.


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post #5 of 9 (permalink) Old 11-04-2018, 10:45 PM
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I'd say that about ScotchLoks, but I use butt crimps all the time, and have very few problems from them. Maybe 2 failures in the past 25 years.
I won't use them at all.

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post #6 of 9 (permalink) Old 11-05-2018, 10:39 AM Thread Starter
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Thanks guys' really appreciate your advice. Solder and heat shrink it is. Steve83, thanks for the graphic. And Bugman.....lol!
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post #7 of 9 (permalink) Old 11-13-2018, 11:01 AM Thread Starter
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Finally got around to this and you guys were correct. While i was in there I found another butt splice so cut that out too. Solder and heat shrink and we're good, works. Thanks again.

Jared
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post #8 of 9 (permalink) Old 11-13-2018, 10:08 PM
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So your butt splices were never the problem, right? It was always that other one that had been done incorrectly?


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post #9 of 9 (permalink) Old 11-14-2018, 11:24 AM Thread Starter
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Could have been both but definitely mine considering water made it work.
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