Lights flicker 1972 Chevy Truck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mvpco · 04-16-2005, 04:54 PM

HI List!

I am stumped!
My lights(Headlights, dash etc) flicker when driving or parked. I can move the shifter (350, AUTO on the column) and when I put pressure on the gear shift it stops flickering, I can jiggle the shifter and see the lights flicker.

What I have done,
New Battery (still flickers)
New Alternator(still flickers)
I even disconnected the neutral safety switch and still flickers

also I noticed my dimmer switch does not have high beam, (I ordered one)
I have also ordered a new Headlight switch...

I checked the junction on the passenger side by battery and replaced that wire, (still flickers)

Any ideas?

Jeff Smith
Pensacola, FL
850-475-5030

71-longbed · 04-16-2005, 05:13 PM

HIgh beam switch if on the floor on the left hand side ..its seperate from the headlight switch .... check all your grounds .. alternator connections and such ...

HuggerCST · 04-16-2005, 11:21 PM

Bad ground. I had the same problem, but basically when you move the shifter, the cab gets it's ground through the linkage. I fixed mine by adding a ground strap between the cab and engine block.

incoma · 04-16-2005, 11:30 PM

I triple the other comments. Bad ground.

mvpco · 04-17-2005, 10:18 AM

Thanks! I will try and post back.

Jeff

mvpco · 04-17-2005, 01:52 PM

I ran a ground from the firwall to engine block and all is working, I will try tonight when dark also

Thanks all!

Jeff

mvpco · 04-17-2005, 10:03 PM

Well I tried tonight and works great!!!!

Thanks all!

Jeff

HuggerCST · 04-17-2005, 10:23 PM

Great! I'm glad it was a simple fix for you.

mvpco · 04-18-2005, 04:51 AM

Yes, after I messed with it for over a month then broke down and ask about it here on the list, took about 4 hours to get a reply, then I tried it and it worked, simple only when the right answer is given.

Thanks again and GREAT Forum!!!!

Jeff

farside847 · 04-18-2005, 11:30 AM

I have a similar problem, where on the firewall did you attach it?

HuggerCST · 04-18-2005, 12:36 PM

I put mine on one of the studs for the brake booster. The factory ground straps attach to the firewall on each side of the engine, and run to a valve cover bolt on each head (v-8) if I'm not mistaken.

04-16-2005, 04:54 PM	#1
mvpco Registered User Join Date: Apr 2005 Location: Pensacola, FL Posts: 400	Lights flicker 1972 Chevy Truck HI List! I am stumped! My lights(Headlights, dash etc) flicker when driving or parked. I can move the shifter (350, AUTO on the column) and when I put pressure on the gear shift it stops flickering, I can jiggle the shifter and see the lights flicker. What I have done, New Battery (still flickers) New Alternator(still flickers) I even disconnected the neutral safety switch and still flickers also I noticed my dimmer switch does not have high beam, (I ordered one) I have also ordered a new Headlight switch... I checked the junction on the passenger side by battery and replaced that wire, (still flickers) Any ideas? Jeff Smith Pensacola, FL 850-475-5030

04-16-2005, 05:13 PM	#2
71-longbed Its Magically Delicious Join Date: Jan 2003 Location: oregon Posts: 2,398	HIgh beam switch if on the floor on the left hand side ..its seperate from the headlight switch .... check all your grounds .. alternator connections and such ... __________________ 71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee.

04-16-2005, 11:21 PM	#3
HuggerCST Registered User Join Date: Jul 2001 Location: North Louisiana Posts: 4,501	Bad ground. I had the same problem, but basically when you move the shifter, the cab gets it's ground through the linkage. I fixed mine by adding a ground strap between the cab and engine block. __________________ Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com

04-17-2005, 10:18 AM	#5
mvpco Registered User Join Date: Apr 2005 Location: Pensacola, FL Posts: 400	Lights Flicker Thanks! I will try and post back. Jeff

04-17-2005, 01:52 PM	#6
mvpco Registered User Join Date: Apr 2005 Location: Pensacola, FL Posts: 400	Lights Flicker I ran a ground from the firwall to engine block and all is working, I will try tonight when dark also Thanks all! Jeff

04-16-2005, 11:30 PM	#4
incoma Registered User Join Date: Mar 2004 Location: Lexington, KY Posts: 865	I triple the other comments. Bad ground.

04-17-2005, 10:03 PM	#7
mvpco Registered User Join Date: Apr 2005 Location: Pensacola, FL Posts: 400	Lights flicker Well I tried tonight and works great!!!! Thanks all! Jeff

04-17-2005, 10:23 PM	#8
HuggerCST Registered User Join Date: Jul 2001 Location: North Louisiana Posts: 4,501	Great! I'm glad it was a simple fix for you. __________________ Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com

04-18-2005, 04:51 AM	#9
mvpco Registered User Join Date: Apr 2005 Location: Pensacola, FL Posts: 400	Lights flicker fixed Yes, after I messed with it for over a month then broke down and ask about it here on the list, took about 4 hours to get a reply, then I tried it and it worked, simple only when the right answer is given. Thanks again and GREAT Forum!!!! Jeff

04-18-2005, 11:30 AM	#10
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	I have a similar problem, where on the firewall did you attach it? __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

04-18-2005, 12:36 PM	#11
HuggerCST Registered User Join Date: Jul 2001 Location: North Louisiana Posts: 4,501	I put mine on one of the studs for the brake booster. The factory ground straps attach to the firewall on each side of the engine, and run to a valve cover bolt on each head (v-8) if I'm not mistaken. __________________ Wynne 70 CST short fleet Hugger orange & white, 350/350, ps, pb, air, tilt, tach/vac/speedwarning, original buckets, AM/FM, oak bed floor, shoulder belts, 3.5"/5.5" drop, 20" American Racing VN425s. Build thread 53 Chevy shortbed 69 Camaro Click here to subscribe Chevy GMC International Truck Club Louisiana Charter Member http://www.louisianaclassictruckclub.com

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