1989 Crewcab dually no start/wiring problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**1774btcrew** · 11-10-2015, 07:27 PM

I know there are some members on here that are extremely good at wiring but this is FAR from my strong point! This is actually my friend's truck but he isn't a member of this board and I have been over trying to help him get it going. When he purchased this truck it had been converted to carburetor. He got the correct motor and installed it. We can get the truck to crank over but there is no power to either side of the ECMB fuse, the t/l ctsy fuse, horn/dm and crank fuse. I am sure the t/l, and horn issue is something completely separate from the other issues.
There is one weatherpack plug that isn't attached to anything at the front right cylinder head. There are also two wires that have been cut that come up by the dipstick. Any insight on where these go or why those fuses don't have power would be much appreciated.

mrolds88 · 11-10-2015, 09:39 PM

If it were me, I would pull the fuse box off the firewall and check the power supply headers behind it. then backpeddle the power side of it. Are they all in a line on the fuse box?

**1774btcrew** · 11-11-2015, 12:28 AM

Quote:

Originally Posted by mrolds88

If it were me, I would pull the fuse box off the firewall and check the power supply headers behind it. then backpeddle the power side of it. Are they all in a line on the fuse box?

They actually are in 2 different rows. It had an antitheft switch on it in the cigarette lighter that we removed along with repairing the wiring the was cut to put it in. Truck will crank over.

Brennan · 11-11-2015, 11:02 AM

If I'm not mistaken, the two wires in the last picture are grounds that are supposed to bolt to the back of the passenger side head (with a ring terminal). That could very well be your problem.

Also, the connector in the 2nd picture is for the EGR vacuum solenoid. That would not cause a no-start situation.

Where did your fuel pump relay go? I see the holes on the firewall where the bracket is supposed to be.

**1774btcrew** · 11-11-2015, 06:08 PM

The relays are still connected. Just not bolted to the firewall. Kind of resting on the A/C box

**1774btcrew** · 11-11-2015, 06:28 PM

Thanks for the heads up on the grounds. Will try that and go from there

**1774btcrew** · 11-13-2015, 12:33 AM

The grounds didn't sort out my problems. Anyone else have any ideas?

mrolds88 · 11-14-2015, 02:16 AM

All the fusible links ok??

ZacharyDouglas1992 · 11-25-2015, 06:15 PM

this doesn't answer your issue about the ECMB not receiving power- but I do know that as long as it isn't, you may have issues getting the truck to run. Pretty sure the fuel tank selector switch/fuel pumps/selector valve all rely on that. Was the truck using a mechanical fuel pump when it was switched to the carb? Or still using the electric pumps in the tanks?

11-10-2015, 07:27 PM	#1
1774btcrew Senior Member Join Date: Jun 2009 Location: Phoenix AZ Posts: 4,602	1989 Crewcab dually no start/wiring problems I know there are some members on here that are extremely good at wiring but this is FAR from my strong point! This is actually my friend's truck but he isn't a member of this board and I have been over trying to help him get it going. When he purchased this truck it had been converted to carburetor. He got the correct motor and installed it. We can get the truck to crank over but there is no power to either side of the ECMB fuse, the t/l ctsy fuse, horn/dm and crank fuse. I am sure the t/l, and horn issue is something completely separate from the other issues. There is one weatherpack plug that isn't attached to anything at the front right cylinder head. There are also two wires that have been cut that come up by the dipstick. Any insight on where these go or why those fuses don't have power would be much appreciated. __________________ AZPartsLocators on Instagram 1972 Cheyenne Super Short Bed big block "Blackie" 1977 Crew Cab GMC Short bed with 4BT Intercooled Cummins Diesel and a 4L80e "The Junkyard Dog" 1985 Crew Cab Chevy dually with 5.9 Cummins "The Big Dog" This is what my dad liked to be called by the grandkids before he passed so it seems fitting for his old truck.

11-10-2015, 09:39 PM	#2
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: 1989 Crewcab dually no start/wiring problems If it were me, I would pull the fuse box off the firewall and check the power supply headers behind it. then backpeddle the power side of it. Are they all in a line on the fuse box? __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

11-11-2015, 11:02 AM	#4
Brennan Registered User Join Date: Jan 2015 Location: Chesapeake Posts: 91	Re: 1989 Crewcab dually no start/wiring problems If I'm not mistaken, the two wires in the last picture are grounds that are supposed to bolt to the back of the passenger side head (with a ring terminal). That could very well be your problem. Also, the connector in the 2nd picture is for the EGR vacuum solenoid. That would not cause a no-start situation. Where did your fuel pump relay go? I see the holes on the firewall where the bracket is supposed to be. Last edited by Brennan; 11-11-2015 at 11:05 AM. Reason: added info

11-11-2015, 06:08 PM	#5
1774btcrew Senior Member Join Date: Jun 2009 Location: Phoenix AZ Posts: 4,602	Re: 1989 Crewcab dually no start/wiring problems The relays are still connected. Just not bolted to the firewall. Kind of resting on the A/C box __________________ AZPartsLocators on Instagram 1972 Cheyenne Super Short Bed big block "Blackie" 1977 Crew Cab GMC Short bed with 4BT Intercooled Cummins Diesel and a 4L80e "The Junkyard Dog" 1985 Crew Cab Chevy dually with 5.9 Cummins "The Big Dog" This is what my dad liked to be called by the grandkids before he passed so it seems fitting for his old truck.

11-11-2015, 06:28 PM	#6
1774btcrew Senior Member Join Date: Jun 2009 Location: Phoenix AZ Posts: 4,602	Re: 1989 Crewcab dually no start/wiring problems Thanks for the heads up on the grounds. Will try that and go from there __________________ AZPartsLocators on Instagram 1972 Cheyenne Super Short Bed big block "Blackie" 1977 Crew Cab GMC Short bed with 4BT Intercooled Cummins Diesel and a 4L80e "The Junkyard Dog" 1985 Crew Cab Chevy dually with 5.9 Cummins "The Big Dog" This is what my dad liked to be called by the grandkids before he passed so it seems fitting for his old truck.

11-13-2015, 12:33 AM	#7
1774btcrew Senior Member Join Date: Jun 2009 Location: Phoenix AZ Posts: 4,602	Re: 1989 Crewcab dually no start/wiring problems The grounds didn't sort out my problems. Anyone else have any ideas? __________________ AZPartsLocators on Instagram 1972 Cheyenne Super Short Bed big block "Blackie" 1977 Crew Cab GMC Short bed with 4BT Intercooled Cummins Diesel and a 4L80e "The Junkyard Dog" 1985 Crew Cab Chevy dually with 5.9 Cummins "The Big Dog" This is what my dad liked to be called by the grandkids before he passed so it seems fitting for his old truck.

11-14-2015, 02:16 AM	#8
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: 1989 Crewcab dually no start/wiring problems All the fusible links ok?? __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

11-25-2015, 06:15 PM	#9
ZacharyDouglas1992 Registered User Join Date: Nov 2013 Location: Fowler California Posts: 140	Re: 1989 Crewcab dually no start/wiring problems this doesn't answer your issue about the ECMB not receiving power- but I do know that as long as it isn't, you may have issues getting the truck to run. Pretty sure the fuel tank selector switch/fuel pumps/selector valve all rely on that. Was the truck using a mechanical fuel pump when it was switched to the carb? Or still using the electric pumps in the tanks? __________________ 1967 CHEVELLE MALIBU 427/700R4 1971 CHEYENNE 10 350/350 1983 GMC K3500 454/400/205 1987 R10 TBI 350/700R4 2014 CRUZE 2.0 TURBO DIESEL



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