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Author Topic: Back up lights now always on  (Read 1663 times)

Offline Jerr-conn

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Back up lights now always on
« on: July 03, 2019, 04:20:39 PM »
My 87 r10 350 tbi 700 r4 2 wheel drive back up lights are on all time key is on. What I'd
Like to know is :  1-- is the bu light switch part of the neutral safety switch . Or 2 --- is
The bu switch mounted in the 700 r4 trans ? OR what?  is this a common problem , cause
I need to get it fixed.    Thanks.
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Jerry

Offline zieg85

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Re: Back up lights now always on
« Reply #1 on: July 03, 2019, 04:30:44 PM »
Switch is down on top of the steering column down by the firewall. 
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Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Online bd

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Re: Back up lights now always on
« Reply #2 on: July 03, 2019, 05:03:15 PM »
...and it is combined with the neutral safety switch in a plastic assembly.
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline zieg85

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Re: Back up lights now always on
« Reply #3 on: July 03, 2019, 05:38:45 PM »
Quote from: bd on July 03, 2019, 05:03:15 PM
...and it is combined with the neutral safety switch in a plastic assembly.

Same switch but 2 plugs go to it I think.  The one plug at the 12:00 position is for the back up lights and can be unplugged until you can fix it properly.
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Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline 75gmck25

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Re: Back up lights now always on
« Reply #4 on: July 04, 2019, 06:02:08 AM »
The position of the switch is also affected by the height of the body relative to the transmission linkage.  My NSS switch never worked correctly in both Park and Neutral until I replaced the body mounts and got the cab back up to normal height.   

Bruce
« Last Edit: July 04, 2019, 06:04:27 AM by 75gmck25 »
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Offline Jerr-conn

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Re: Back up lights now always on
« Reply #5 on: July 19, 2019, 09:08:51 AM »
Install d n w neutral safety switch.now everything works as normal. Thanks guys.
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Jerry
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