Need help pls.. i ve searched and tried throwing every part at it and im not proud of it

[mason916]

Long story so ill try to keep it simple. Friend borrowed truck and it died. Thats all the description i got.found no power to fuel pump so i changed it to no avail. Then it seemed i wasnt getting spark. At one point i was getting the new pump to prime but only without the guages fuse. Insert fuse and nothing. I have searched every post in all the forums i can find and majority say its a ground which i believe. Heres everything ive changed dizzy, icm, both injectors ,fuel pump ignition control on the colum under the dash, new ground wire from engine to frame. It seems ive gone full circle with this. Its got to be an elcetrical issue because during my search i found battery votlage at the ground next to thermostate. And poking around i accidently bumped into the green wire on steering colum with probe and the door chime started to go off.everytime i touch pro e to it it goes off so i must be making the ground right? I have printed every diagram off ive i know what im looking at i just dont know what to do next cause electrical Is all new to me. I rebuilt my 700r4 without any problems so i can turn a wrench. Sorry f
This was so long

 

[RichLo]

How about the fuel pump relay on the firewall?

 

[PlayingWithTBI]

By reading your post ("both injectors" and "700R4") I'm guessing you have an 88 - 91 TBI truck? What engine? Have you looked at the FSM for your truck?

88-98 Service Manuals

Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...

www.gmt400.com

 

[mason916]

How about the fuel pump relay on the firewall?

Yes i check it and replaced it and im getting power out

 

[mason916]

By reading your post ("both injectors" and "700R4") I'm guessing you have an 88 - 91 TBI truck? What engine? Have you looked at the FSM for your truck?

88-98 Service Manuals

Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...

www.gmt400.com

Fsm??and sorry again im a newbie its a 1990 k2500 6lug with 5.7

 

[df2x4]

Fsm??and sorry again im a newbie its a 1990 k2500 6lug with 5.7

FSM = Factory Service Manual. They're GM service manuals that are way more in-depth than other offerings like Chiltons or Haynes. Normally pretty expensive to buy in print form, but you can download them here for free at the link PlayingWithTBI posted. They've got a lot of troubleshooting flow charts that can help you diagnose things.

 

[mason916]

By reading your post ("both injectors" and "700R4") I'm guessing you have an 88 - 91 TBI truck? What engine? Have you looked at the FSM for your truck?

88-98 Service Manuals

Over the years I have collected a bunch of GM service literature. Links to PDF Scans of service and STG manuals and a links to the Parts manuals. You'll need the FREE Adobe Acrobat reader to open these files. Get it directly from Adobe here {http://get.adobe.com/reader/} If you're not...

www.gmt400.com

Yes that

FSM = Factory Service Manual. They're GM service manuals that are way more in-depth than other offerings like Chiltons or Haynes. Normally pretty expensive to buy in print form, but you can download them here for free at the link PlayingWithTBI posted. They've got a lot of troubleshooting flow charts that can help you diagnose things.

I forgot about the factory service but thats where i down loaded the electrical diagrams

 

[mason916]

I guess what im trying to ask is what do i do or what do i look at knowing that im not getti g a grounf to the courtsey chime

 

[Orpedcrow]

I guess what im trying to ask is what do i do or what do i look at knowing that im not getti g a grounf to the courtsey chime

Might be reading too far into the chime ground…

I know you said youve fired the parts cannon already but Start back with the basics. Make sure you’ve got at least 12.5 bolts at the battery. Make sure you’re battery connections are clean and secure. There’s a ground at the back of the truck on the frame close to where the hitch would bolt too, make sure that’s clean and secure.

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I’m sure someone else can chime in where the other grounds are besides the one by the battery and the one behind the head (passenger side?)

 

[Orpedcrow]

Note that basic probes can be misleading, feeding ground into a circuit that might be switched ground and activating things that shouldn’t be

For instance, if the lights are off and the key is not in the ignition then the chime shouldn’t be on but if you ground it then it is acting as if the key is in the ignition completing the ground circuit.