wires for alternator and battery ground wire - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RCOMBS · 03-27-2003, 10:20 AM

Putting back together 72-C10 W/ 350. Need to know where the ground wire for battery is bolted on? and also the 2 wires on the back of the alternator, does the red wire go on the bolt or the stud? Thanks in advance.

*Randy70C-10* · 03-27-2003, 10:45 AM

You should ground the battery to the engine block, and the engine block to the chassis. The red alternator wire goes to the large stud with the plastic donut around it.

RCOMBS · 03-27-2003, 10:57 AM

I guess what I am asking is do you know where on the block is the original place to bolt this ground wire to. and on the alternator i have there is a stud on the back at the bottom and there is a bolt on the back at the top. Which one does the red wire go to. don't mean to sound so stupid just want to make sure it is right.

**Yukon Jack** · 03-27-2003, 11:12 AM

On my 69's 307 the ground wire from the battery went to the front of the engine block, passenger side. I will look for a pic.

**Yukon Jack** · 03-27-2003, 11:16 AM

Here's a pic while I was pulling the engine. The ground wire is right below the valve cover - already disconnected from the battery.

Blue Beard · 03-27-2003, 02:14 PM

my 70 is grounded to the right head as well.............

matt_field · 03-27-2003, 08:51 PM

what if you have no holes in your heads?

6869704X4 · 03-27-2003, 09:19 PM

There is a couple of holes on the front of the block near the fuel pump. You know one of them is the one that goes through to the fuel pump shaft.

Blue68 · 03-28-2003, 01:39 PM

Water pump bolt for the ground wire. The stud on the alternator back is your juice. I have a '98 so my alternator wires are a little different now and can't remember the older style setup.

6869704X4 · 03-29-2003, 11:39 AM

Another place is the thermostat housing bolt. When I switched to long water pump I put mine there along with the alternator bracket.

pierce · 03-29-2003, 11:55 AM

On the alt there's 2 studs, the top is for the red wire and the bottom (smaller) is for the black ground wire.

03-27-2003, 10:20 AM	#1
RCOMBS Registered User Join Date: Dec 2001 Location: CHARLOTTE N.C. Posts: 59	wires for alternator and battery ground wire Putting back together 72-C10 W/ 350. Need to know where the ground wire for battery is bolted on? and also the 2 wires on the back of the alternator, does the red wire go on the bolt or the stud? Thanks in advance.

03-27-2003, 11:12 AM	#4
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	On my 69's 307 the ground wire from the battery went to the front of the engine block, passenger side. I will look for a pic. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

03-27-2003, 11:16 AM	#5
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Here's a pic while I was pulling the engine. The ground wire is right below the valve cover - already disconnected from the battery. Attached Images __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

03-27-2003, 02:14 PM	#6
Blue Beard Registered User Join Date: Jan 2003 Location: Washington State Posts: 8,831	my 70 is grounded to the right head as well............. __________________ 1970 Chev CST 2003 Harley Fatboy 1975 Chevrolet Step Van 1956 Chev Bel Air 1977 Blazer 2WD For Sale $3000.00 1978 Blazer 2WD For Sale $7000.00 1978 Silverado 2005 Monte Carlo

03-27-2003, 08:51 PM	#7
matt_field Registered User Join Date: Apr 2001 Location: Detroit Lakes, Minnesota Posts: 885	what if you have no holes in your heads? __________________ 1971 k5 blazer 80k mike survivor 1972 3/4 ton 4wd Cummins 12v 1967 swb 2wd 427bbc 1968 4wd shortbox 1971 Cheyenne swb k10 unrestored 1971 Cheyenne super 40k 402bb survivor 1967 Chevy k10 (first truck) 1968 L78 camaro survivor 18k miles 1969 z28 survivor 60k miles 1969 z28 survivor 39k miles 1969 z28 rs survivor 80k miles

03-27-2003, 10:45 AM	#2
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	You should ground the battery to the engine block, and the engine block to the chassis. The red alternator wire goes to the large stud with the plastic donut around it.

03-27-2003, 10:57 AM	#3
RCOMBS Registered User Join Date: Dec 2001 Location: CHARLOTTE N.C. Posts: 59	I guess what I am asking is do you know where on the block is the original place to bolt this ground wire to. and on the alternator i have there is a stud on the back at the bottom and there is a bolt on the back at the top. Which one does the red wire go to. don't mean to sound so stupid just want to make sure it is right.

03-27-2003, 09:19 PM	#8
6869704X4 Registered User Join Date: Jul 2002 Location: SE NM Posts: 769	There is a couple of holes on the front of the block near the fuel pump. You know one of them is the one that goes through to the fuel pump shaft. __________________ The more I learn about women, the more I love my truck.

03-28-2003, 01:39 PM	#9
Blue68 Registered User Join Date: Apr 2000 Location: Frisco, Tx, USA Posts: 606	Water pump bolt for the ground wire. The stud on the alternator back is your juice. I have a '98 so my alternator wires are a little different now and can't remember the older style setup. __________________ http://home.comcast.net/~r.landrum/w...tos.html-.html '68 C-10 LWB, '98 Z-71 350 w/accessories (Serpentine), Edelbrock Performer, Edelbrock 1405 (600cfm) carb, GM HEI, CompCam Extreme 4x4 roller cam, Thorley Headers, Carter Electric Fuel Pump, Vintage Air, 700r4, 3.73, disc brakes and power steering upgrades.

03-29-2003, 11:39 AM	#10
6869704X4 Registered User Join Date: Jul 2002 Location: SE NM Posts: 769	Another place is the thermostat housing bolt. When I switched to long water pump I put mine there along with the alternator bracket. __________________ The more I learn about women, the more I love my truck.

03-29-2003, 11:55 AM	#11
pierce Registered User Join Date: Sep 2000 Location: Cincinnati,OH,USA Posts: 464	On the alt there's 2 studs, the top is for the red wire and the bottom (smaller) is for the black ground wire. __________________ 69 GMC 1 Ton Longhorn 37 Chevy Coupe



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