ground strap for block?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tphsmith · 04-02-2005, 08:19 AM

do all motors have a ground strap from the motor to the cab or the frame?. and what does it do?. is it important to have this ground strap? please help and please explain to this idiot. (me)

DTerry · 04-02-2005, 08:45 AM

With factory (rubber) motor and tranny mounts, the only other ground(s) are questionable at best. The battery typically gets grounded to the block, perhaps through a accessory bracket, but the remainder of the vehicle would have to use the questionable grounds. Cab, box, core support, etc., are all mounted on rubber. With out straps to these items, there will be no good ground.

I highly suggest battery ground to block; block to frame; frame to core support, cab, and box.

Fred T · 04-02-2005, 09:03 AM

Ground straps complete the electrical circuit. In the early days, they weren't considered necessary. As technology improved, it was realized that electricity doesn't flow well through rusty bolts or around rubber mounts. Usually straps are attached to the frame and the major body parts, making the frame the primary ground path. GMC Pauls sells a kit with the needed straps and bolts.

One thing, the straps need to be attached to bare metal. Clean the mating surfaces with medium sandpaper and a solvent. Then apply a thin layer of dielectric grease before bolting together.

OhioDan · 04-02-2005, 09:31 AM

You can also purchase the different length straps individually at NAPA. I didn't know the vendors sold sets at the time. Somewhere there's a schematic on where to place them. Haven't seen it in awhile, so I'm not going to try and tell you where they go. I'm sure someone on here has it and would pass the info to you? Hope this helps?

04-02-2005, 08:19 AM	#1
tphsmith still buypickupparts Join Date: Sep 2003 Location: charlotte Posts: 637	ground strap for block?? do all motors have a ground strap from the motor to the cab or the frame?. and what does it do?. is it important to have this ground strap? please help and please explain to this idiot. (me) __________________ Its Gonna be a Great Day, I woke up this Morning. 72 SWB Fleetside freshly painted. putting a 94 LT1 with 700R4 tranny lowered 4 in the front 6 in the back 81 chevy half ton 350 89 Silverado 4x4 going ta church truck

04-02-2005, 08:45 AM	#2
DTerry '70 GMC C-25 LWB Join Date: Oct 2004 Location: Binghamton, N.Y. Posts: 273	With factory (rubber) motor and tranny mounts, the only other ground(s) are questionable at best. The battery typically gets grounded to the block, perhaps through a accessory bracket, but the remainder of the vehicle would have to use the questionable grounds. Cab, box, core support, etc., are all mounted on rubber. With out straps to these items, there will be no good ground. I highly suggest battery ground to block; block to frame; frame to core support, cab, and box. __________________ 1970 GMC C-25 LWB (middle of frame up) 5-7 drop with 3in drop spindles, flip kit with blocks and still keeping the 3/4 ton. Shaved drip rails and marker lights, rear roll pan, cowl induction hood. 1987 Camaro z28 350, vortec 305 heads. 10:1 comp, t5 trans. Street terrrorizer. 1988 Monte Carlo (Super Stock ashpalt race car) My Truck

04-02-2005, 09:03 AM	#3
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Ground straps complete the electrical circuit. In the early days, they weren't considered necessary. As technology improved, it was realized that electricity doesn't flow well through rusty bolts or around rubber mounts. Usually straps are attached to the frame and the major body parts, making the frame the primary ground path. GMC Pauls sells a kit with the needed straps and bolts. One thing, the straps need to be attached to bare metal. Clean the mating surfaces with medium sandpaper and a solvent. Then apply a thin layer of dielectric grease before bolting together. __________________ Fred There is no such thing as too much cam...just not enough engine.

04-02-2005, 09:31 AM	#4
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	You can also purchase the different length straps individually at NAPA. I didn't know the vendors sold sets at the time. Somewhere there's a schematic on where to place them. Haven't seen it in awhile, so I'm not going to try and tell you where they go. I'm sure someone on here has it and would pass the info to you? Hope this helps? __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.



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