name this part,tbi 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BigrobDog · 04-02-2013, 08:32 PM

I have chevy tbi in 72, donor harness is 1991 chevy 1500 . engine is 1990 suburban,
I have a couple of pieces on the harness that im not sure of , if u know please tell me what they are and what they do please.

one is the plug with 2 gray wires going in to it that is jumped with a fuse .this plug with the fuse if u pull it truck stops running. i believe its some how attached to the fuel pump relay.

the other is this gray box has a circuit board in it,

the other is the fuel pump relay green/ white wire. only starts if i have 12 volts to gr/ white wire. it is partly bare to attach 12v to , is this all right cant find any were to attach 12 to get it to work any ideas.

**TBONE1964** · 04-02-2013, 08:43 PM

The item in the first photo is simply a fuse holder and most likely powers the fuel pump relay if that is where on of the grey wires is going. The other wire should be connected to battery voltage or ignition voltage somewhere.

The grey box with the circut board does not look factory. Is that all purple wires coming out of it? Where do they go? This looks like it might be some type of alarm gizmo but not sure.

Stay tuned for more information

**bowtie72** · 04-02-2013, 08:44 PM

Firts pic with the fuse should be your fuse for the ECM. Not sure about the second pic maybe with the Vehicle speed sensor? Third pic is your fuel pump relay. I also installed a TBI system on my 72 Blazer. I used a custom harness it got rid of the junk you don't need. Good luck I'll help where I can

**bowtie72** · 04-02-2013, 08:47 PM

Ok rereading your post looks like someone wired a fuse in line with the relay for the fuel pump.

BigrobDog · 04-02-2013, 08:53 PM

Quote:

Originally Posted by bowtie72

Ok rereading your post looks like someone wired a fuse in line with the relay for the fuel pump.

no this is stock harness was just thinking had some thing to do with fuel , may be not . I think your right it being fuse holder. bought that way with the fuse in it . what is weird is if u take fuse out and test one side has power that goes to computer and other reads ground bl/wh on the computer. plug in fuse and runs great,

**special-K** · 04-02-2013, 10:32 PM

Try posting in the right message board. You'll find members more familiar with the workings of TBI if that's what they drive. I can't go out and look at my '72 to compare.

BigrobDog · 04-02-2013, 10:40 PM

thanks for your help, special k

kelbystanley · 04-07-2013, 12:41 AM

if you can give me the service number on you ecm i can get you a pinout sheet with what wires go where.

BigrobDog · 04-07-2013, 05:03 PM

here u go i hope this is it

BigrobDog · 04-07-2013, 06:44 PM

Quote:

Originally Posted by kelbystanley

if you can give me the service number on you ecm i can get you a pinout sheet with what wires go where.

thanks for your help

kelbystanley · 04-07-2013, 11:49 PM

here you go

kelbystanley · 04-07-2013, 11:50 PM

i have some more that are a little more detailed if you need them but i'll have to email them as they are to big to post

kelbystanley · 04-07-2013, 11:54 PM

kelbystanley · 04-07-2013, 11:58 PM

1227747 is the ecm service no. the asdu letters on the right side is the service no. for the computer chip in the ecu.

04-02-2013, 08:32 PM	#1
BigrobDog Registered User Join Date: Feb 2013 Location: Mandan Posts: 80	name this part,tbi 350 I have chevy tbi in 72, donor harness is 1991 chevy 1500 . engine is 1990 suburban, I have a couple of pieces on the harness that im not sure of , if u know please tell me what they are and what they do please. one is the plug with 2 gray wires going in to it that is jumped with a fuse .this plug with the fuse if u pull it truck stops running. i believe its some how attached to the fuel pump relay. the other is this gray box has a circuit board in it, the other is the fuel pump relay green/ white wire. only starts if i have 12 volts to gr/ white wire. it is partly bare to attach 12v to , is this all right cant find any were to attach 12 to get it to work any ideas. Attached Images

04-02-2013, 08:43 PM	#2
TBONE1964 Cluster King Join Date: Nov 2012 Location: Junction City, OR Posts: 5,263	Re: name this part,tbi 350 The item in the first photo is simply a fuse holder and most likely powers the fuel pump relay if that is where on of the grey wires is going. The other wire should be connected to battery voltage or ignition voltage somewhere. The grey box with the circut board does not look factory. Is that all purple wires coming out of it? Where do they go? This looks like it might be some type of alarm gizmo but not sure. Stay tuned for more information

04-02-2013, 08:44 PM	#3
bowtie72 Registered User Join Date: Mar 2007 Location: Colorado Posts: 361	Re: name this part,tbi 350 Firts pic with the fuse should be your fuse for the ECM. Not sure about the second pic maybe with the Vehicle speed sensor? Third pic is your fuel pump relay. I also installed a TBI system on my 72 Blazer. I used a custom harness it got rid of the junk you don't need. Good luck I'll help where I can __________________ 1968 SWB "Little White Truck" 1972 LWB LS 4l80 "Plain Jane!!"

04-02-2013, 08:47 PM	#4
bowtie72 Registered User Join Date: Mar 2007 Location: Colorado Posts: 361	Re: name this part,tbi 350 Ok rereading your post looks like someone wired a fuse in line with the relay for the fuel pump. __________________ 1968 SWB "Little White Truck" 1972 LWB LS 4l80 "Plain Jane!!"

04-02-2013, 10:32 PM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,859	Re: name this part,tbi 350 Try posting in the right message board. You'll find members more familiar with the workings of TBI if that's what they drive. I can't go out and look at my '72 to compare. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 04-02-2013 at 11:20 PM.

04-02-2013, 10:40 PM	#7
BigrobDog Registered User Join Date: Feb 2013 Location: Mandan Posts: 80	Re: name this part,tbi 350 thanks for your help, special k

04-07-2013, 12:41 AM	#8
kelbystanley Registered User Join Date: Sep 2012 Location: Lafayette, LA Posts: 39	Re: name this part,tbi 350 if you can give me the service number on you ecm i can get you a pinout sheet with what wires go where.

04-07-2013, 05:03 PM	#9
BigrobDog Registered User Join Date: Feb 2013 Location: Mandan Posts: 80	Re: name this part,tbi 350 here u go i hope this is it Attached Images

04-07-2013, 11:49 PM	#11
kelbystanley Registered User Join Date: Sep 2012 Location: Lafayette, LA Posts: 39	Re: name this part,tbi 350 here you go Attached Images

04-07-2013, 11:50 PM	#12
kelbystanley Registered User Join Date: Sep 2012 Location: Lafayette, LA Posts: 39	Re: name this part,tbi 350 i have some more that are a little more detailed if you need them but i'll have to email them as they are to big to post

04-07-2013, 11:54 PM	#13
kelbystanley Registered User Join Date: Sep 2012 Location: Lafayette, LA Posts: 39	Re: name this part,tbi 350 Attached Images

04-07-2013, 11:58 PM	#14
kelbystanley Registered User Join Date: Sep 2012 Location: Lafayette, LA Posts: 39	Re: name this part,tbi 350 1227747 is the ecm service no. the asdu letters on the right side is the service no. for the computer chip in the ecu.



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