What security measures do you have on your truck - cut off switch? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Orange Crate · 02-19-2026, 12:29 PM

I was just thinking about this same subject. I have EFI so I might just take the fuel pump relay with me and/or fuse.

**MikeB** · 02-19-2026, 12:32 PM

I have always wondered how a "line lock" set up would work to keep the wheels from turning. But it would have to hold the hydraulic pressure for several hours at a minimum.

Call me naive, but how would a thief start the engine w/o a key? Is it some kind of brute force deal, or reaching under the dash and grabbing the wire bundle, like in the movies?

**Steeveedee** · 02-19-2026, 02:04 PM

Pull the plug off the ignition switch and put a jumper wire from the hot gozinta wire to the ignition power wire (wh/or/purp), and use a momentary jumper from the hot gozinta wire to the purple wire and you're down the road.

02-19-2026, 12:29 PM	#26
Orange Crate Registered User Join Date: Feb 2011 Location: Under the Truck Dreaming Posts: 889	Re: What security measures do you have on your truck - cut off switch? I was just thinking about this same subject. I have EFI so I might just take the fuel pump relay with me and/or fuse. __________________ 72 K20 Custom Camper, D60, 14BFF, full roller 406 TPI w custom built ECU and yes..it has tow hooks, a 5 speed AND a front hitch!

02-19-2026, 12:32 PM	#27
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 4,038	Re: What security measures do you have on your truck - cut off switch? I have always wondered how a "line lock" set up would work to keep the wheels from turning. But it would have to hold the hydraulic pressure for several hours at a minimum. Call me naive, but how would a thief start the engine w/o a key? Is it some kind of brute force deal, or reaching under the dash and grabbing the wire bundle, like in the movies? __________________ Mike 1969 Custom/10 LWB -- owned for 37 years. 350/TH350, 3.08 posi, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. Hedman stainless headers. Old Air installation in progress. 1982 Custom Deluxe 10 SWB -- converted from 250-six to roller cam 350 w/ Vortec heads -- sold 1981 C10 Silverado LWB, 305, TH350C -- sold, but wish I still had it! 1969 C10 (not the current one) which I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 26 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

02-19-2026, 02:04 PM	#28
Steeveedee Ram-A-Lam-A-Ding-Dong Join Date: Jan 2013 Location: Simi Valley, CA Posts: 11,901	Re: What security measures do you have on your truck - cut off switch? Pull the plug off the ignition switch and put a jumper wire from the hot gozinta wire to the ignition power wire (wh/or/purp), and use a momentary jumper from the hot gozinta wire to the purple wire and you're down the road. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA



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