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Old 03-15-2018, 09:19 AM   #1
Oktsme
 
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Question Back up lights not working properly

1987 Nissan Hardbody SE, 3.0L, 4X4. I may have this in the wrong category since the problem is not directly electrical. It is not the wiring, bulbs, or the switch. The problem seems to be that when it is installed in the transmission and put in reverse (ignition key on), the lights won't come on. If I take out my back up light switch, keep it wired up, turn on the ignition key and push in the button on the switch, the lights work. The switch is new as I thought maybe the old one was worn although it tested good. I can only think that it must have something to do with whatever the actuator is inside the transmission and how the shifter/actuator makes contact with the switch. Anyone have any suggestions or experience in this regard? Thanks!
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Old 03-15-2018, 08:29 PM   #2
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Just by your description of the working switch outside the trans, I would be inclined to agree with you. It sounds like whatever is supposed to actuate the switch is not doing its job. Let us know what you find out if you get it fixed.
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Old 03-15-2018, 08:41 PM   #3
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We have a member here who rebuilds transmissions. Let’s see what he says. Johnber is his user id.
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Old 03-15-2018, 09:55 PM   #4
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shot in the dark here... oem pt# 32180-31G00 "reverse checking" looks like it is held in by one screw on the drivers side of the case, towards the top.. below the shifter.. make sense? try to google pic.. just a thought, but I hope it helps
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Old 03-16-2018, 12:34 AM   #5
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its a detent on that shift rod, pull the switch and measure the depth in neutral, then measure it the the trans in reverse . sounds like it aint in deep enuf.
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Old 03-17-2018, 12:37 AM   #6
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Cool Detent

I took out the switch and measured it in neutral and in reverse. It appears the length is about the same. In other words, the end of the switch probably just barely touches the detent if it does at all. The new and old switches I have are the correct ones for this application. I suspect the detent is warn enough so that it doesn't contact the end of the switch. I will have to see if I can find a suitable replacement with a longer shaft/overall inserted length. I will update the progress on the solution. Thanks for all the inputs!
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Old 03-24-2018, 08:57 AM   #7
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Smile Final Update

I couldn't find a suitable substitute switch. It would have needed one just a few mm longer. I decided instead to bypass the switch and wired up a toggle switch and mounted it on the dash. I don't put a lot of miles on this truck and have gone a long time without the back up lights working at all. If I ever got into a situation where I needed to warn anyone I was backing up, I would tap my brakes a number of times and slowly move backwards. They would figure it out. Now, I can properly warn the other drivers. Just don't get too close behind me at a traffic light. I can flip the switch and take off going forward and leave you scratching your head.
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