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Old 05-15-2022, 01:45 PM   #1
71gmcC15
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Why does my manual transmission 81 k10 have a neutral safety wireing

Was taking out all the aftermarket cruise control wiring and noticed a factory plug that was jumped together. Found out it was for a neutral safety switch. Its a Factory 4 speed. No safety switch on the column. Looked for maby a clutch safety switch. Thare is none that I could find. For fun I unjumped the wiring and yep won't start with out it jumped.
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Old 05-16-2022, 08:01 AM   #2
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Re: Why does my manual transmission 81 k10 have a neutral safety wireing

I had an '80 K30 4spd and it had a neutral safety switch from factory. That is the earliest truck I had with one. I'm pretty sure the 4spd '78 C30 I had didn't. I remember the one in the '80 went out
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Old 05-16-2022, 08:16 AM   #3
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Re: Why does my manual transmission 81 k10 have a neutral safety wireing

My 81 didnt have a nss, it did have a switch on clutch pedal though
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Old 05-16-2022, 04:48 PM   #4
71gmcC15
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Re: Why does my manual transmission 81 k10 have a neutral safety wireing

I am thinking now that it was a clutch switch that was removed and by passed. That's ok with me. Im so used to it. My 71 doesnt no fancy safety stuff so neither does my 81.
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( second times the charm) 71 gmc c15 307 sbc 373 rear gears positrac sm 465 trans. ( not listed on spid but is original )
94 chevy k1500 350 tbi 373 rear gears 4l60e one wheel peel. Gutless
07 gmc sierra classic rcsb 4.3 lt 5 speed w/t
04 chevy Silverado 1500 ext cab 5.3 4l60e.
81 chevy Scottsdale k10 muncie sm465 Np208 10 bolt 8.2 ( Old Green)

Last edited by 71gmcC15; 05-16-2022 at 06:04 PM.
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Old 05-17-2022, 09:34 AM   #5
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Re: Why does my manual transmission 81 k10 have a neutral safety wireing

My 74 has the clutch pedal safety switch
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Old 05-17-2022, 04:38 PM   #6
hatzie
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Re: Why does my manual transmission 81 k10 have a neutral safety wireing

The clutch starter interlock switch has a pigtail that runs from the clutch switch over to the Neutral Safety Switch plug at the base of the steering column. Cruise control should add another pair of wires on the clutch switch.

The manual transmission backup lamp wiring is a similar adaptation. It's a pigtail that plugs into the backup lamp switch on the transmission and runs through the firewall to the backup lamp plug that would fit onto the backup lamp switch on the automatic transmission NSS at the base of the column.

Three on the tree has a switch similar to or the same as the neutral safety switch to control the backup lamps.
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