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1975 GMC C10 · 10-26-2012, 10:05 PM

hey all im in need of some help bad... I did a really stupid move the other day got new battery and the positive and negitive posts were different then the one my other battery was and i put the cables on wrong and well my wires to the firewall went up in smoke and now my truck sounds like its battery is dead but lights are bright and motor sometimes rolls over but wont start please help me with this thanks

**old Rusty C10** · 10-26-2012, 10:08 PM

change the wires and check the fusible link up there its prolly toasted

1975 GMC C10 · 10-26-2012, 10:14 PM

ok im new to the old trucks what wires am i needing to change and what link you talking the red power wires from starter and alt. to firewall???? thanks

**old Rusty C10** · 10-26-2012, 10:33 PM

yes there is a fusible link up by the firewall... i cant get to my gas truck or id give you a pic.. perhaps someone else can

1975 GMC C10 · 10-26-2012, 10:51 PM

the one from the starter to the firewall i have changed that one all ready and i have looked at the one to the alt. and it seemed to be in good shape other then the with that connects to the harness that goes to the fuse panel there is a little bit of corrosion there
thanks

75 big 10 · 10-27-2012, 01:22 AM

I blew the one on my 75 recently. Look at the harness for a black connector. If you pull it apart there is a fuse in there. There Is another one closer to the fuse box below the master cylinder.
Posted via Mobile Device

1975 GMC C10 · 10-27-2012, 09:56 AM

oh so it will blow instead of continuing into the cab and frying them wires too ok i will look at them thanks

88Jimmy4x4 · 10-27-2012, 10:15 AM

I think I would buy a new engine harness for $120

1975 GMC C10 · 10-27-2012, 01:13 PM

where would i get one of them from as i can only find whole complete kits for $650 let me know where thanks

10-26-2012, 10:05 PM	#1
1975 GMC C10 Registered User Join Date: Oct 2012 Location: peterborough ontario Posts: 8	need help hey all im in need of some help bad... I did a really stupid move the other day got new battery and the positive and negitive posts were different then the one my other battery was and i put the cables on wrong and well my wires to the firewall went up in smoke and now my truck sounds like its battery is dead but lights are bright and motor sometimes rolls over but wont start please help me with this thanks

10-26-2012, 10:08 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,345	Re: need help change the wires and check the fusible link up there its prolly toasted __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

10-26-2012, 10:14 PM	#3
1975 GMC C10 Registered User Join Date: Oct 2012 Location: peterborough ontario Posts: 8	Re: need help ok im new to the old trucks what wires am i needing to change and what link you talking the red power wires from starter and alt. to firewall???? thanks

10-26-2012, 10:33 PM	#4
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,345	Re: need help yes there is a fusible link up by the firewall... i cant get to my gas truck or id give you a pic.. perhaps someone else can __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

10-26-2012, 10:51 PM	#5
1975 GMC C10 Registered User Join Date: Oct 2012 Location: peterborough ontario Posts: 8	Re: need help the one from the starter to the firewall i have changed that one all ready and i have looked at the one to the alt. and it seemed to be in good shape other then the with that connects to the harness that goes to the fuse panel there is a little bit of corrosion there thanks

10-27-2012, 01:22 AM	#6
75 big 10 Registered User Join Date: Jan 2012 Location: Farmington New Mexico Posts: 43	Re: need help I blew the one on my 75 recently. Look at the harness for a black connector. If you pull it apart there is a fuse in there. There Is another one closer to the fuse box below the master cylinder. Posted via Mobile Device __________________ ASA Chapter Lead-New Mexico/Arizona 75 C10 Scottsdale. 454/400th. 373 rear 76 C20 Custom Delux 350/4 speed 411 Posi rear

10-27-2012, 09:56 AM	#7
1975 GMC C10 Registered User Join Date: Oct 2012 Location: peterborough ontario Posts: 8	Re: need help oh so it will blow instead of continuing into the cab and frying them wires too ok i will look at them thanks

10-27-2012, 10:15 AM	#8
88Jimmy4x4 Registered User Join Date: Oct 2003 Location: houston, texas Posts: 1,974	Re: need help I think I would buy a new engine harness for $120 __________________ 2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB

10-27-2012, 01:13 PM	#9
1975 GMC C10 Registered User Join Date: Oct 2012 Location: peterborough ontario Posts: 8	Re: need help where would i get one of them from as i can only find whole complete kits for $650 let me know where thanks



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