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#1 |
Senior Member
![]() Join Date: Aug 2010
Location: North Alabama
Posts: 1,045
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Replaced Dash Harness and now no start
I decided to replace my under dash harness since the fuse block was so corroded none of the fuses were even fully held in. I purchased an M&H unit and the install was pretty straight forward. Even with the corroded fuse block I was stilla ble to start the truck every time and the headlights, dome light, horn, and taillights worked. No dash lights worked.
After replacement, the truck does not start. Almost like a dead battery or bad starter. The only light I get anywhere is the brake light in the instrument cluster which did not previously work. Being optimistic about it at least something now works ![]() Anyway, I've tried jiggling the ignition harness around and that did nothing. The truck is a manual transmission so, I do not think neutral safety switch is an issue. I'm thinking about pulling the fuse block back off and trying to reconnect it with the engine harness again to see if that helps.
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1970 C10 to K20 conversion 1974 GMC Jimmy 1968 50th Anniversary Short Bed 1968 Chevelle 1964 Comet Caliente 1990 W250 Cummins |
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#2 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Replaced Dash Harness and now no start
Power comes in via the big red in the bottom right corner of the harness (facing the firewall from outside). Check that first - it's connected to the junction block, alternator, all of that.
Then check the opposite side of it (don't know the color offhand, but it should be obvious) and make sure it's coming through on that wire.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#3 |
Registered User
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 2,177
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Re: Replaced Dash Harness and now no start
No magic pill here, you are gonna have to diagnose and recheck everything.
Anything anyone says would be a shot in the dark. Good luck.
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"Work hard, use your vacation days." 1970 C15 GMC Long Bed 1986 C20 Scottsdale 1983 K2500 Sierra Classic Suburban 6.2 Instagram: C10sofOC |
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#4 |
Active Member
![]() Join Date: Sep 2007
Location: Benicia, CA
Posts: 131
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Re: Replaced Dash Harness and now no start
I put the inside fuse block in upside down once.
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#5 |
Registered User
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,191
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Re: Replaced Dash Harness and now no start
Does the new wiring harness come with provisions for a neutral safety switch for an automatic transmission? If so, then you will need to jump the wires to fool it into thinking the neutral safety switch is closed. Otherwise, you will not be able to start the truck.
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#6 | |
Senior Member
![]() Join Date: Aug 2010
Location: North Alabama
Posts: 1,045
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Re: Replaced Dash Harness and now no start
Quote:
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1970 C10 to K20 conversion 1974 GMC Jimmy 1968 50th Anniversary Short Bed 1968 Chevelle 1964 Comet Caliente 1990 W250 Cummins |
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#7 |
Registered User
![]() Join Date: May 2016
Location: Sackets harbor ny
Posts: 282
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Re: Replaced Dash Harness and now no start
You probably already checked this. Make sure all your ground wires are hooked up. And you have a good ground contact to the block and the frame. Hope this helps.
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#8 |
Senior Member
![]() Join Date: Sep 2014
Location: Wenatchee, Wa
Posts: 910
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Re: Replaced Dash Harness and now no start
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#9 | |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,151
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Re: Replaced Dash Harness and now no start
Quote:
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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