Electrical Help with "72" Jimmy - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Vlad · 01-27-2004, 02:18 PM

I hope someone can help me ....

I have a 72 Jimmy that I can't seem to get the dash Voltage gauge to work. Does anyone happen to have a wiring schematic they could email me. This would help me a great deal to possibly trace the wiring problem. I have tried replacing the the gauge with no success,and i am getting voltage on one side of the gauge. Any help would be appreciated
please email to: cvladski@aol.com
Thanks..
Vlad

jhow66 · 01-27-2004, 03:08 PM

Check your fuses .(not in fuse panel) One is near battery-small black wire with a fuse holder inline (4amp)-it then goes to other side near voltage reg. where there is another just like it. Hope this helps.

bpmcgee · 01-28-2004, 03:27 PM

Every one of these trucks I've ever seen, that guage was dead. It may actually be the guage and not your wiring.

Brian

**pound41** · 01-29-2004, 11:27 AM

The one in my 70 blazer is dead like yours but the one in my 71 blazer works great. start it up for the first time in a hile and it jumps up there then settles back down. But my 70 I cannot get to to work let me know if anyone figures this out. Had the same problem with a 75 put in a new guage/printed circuit and still got nothing

JimKshortstep4x4 · 01-29-2004, 01:39 PM

Here is a link to wiring diagrams.

Jim

http://www.geocities.com/chevroletc1070/wiringdias.html

SS55 · 01-31-2004, 04:43 AM

I have had to troubleshoot and repair quite a few of the 67-72 style factory ammeter setups. The ammeter is a shunt circuit that basically parallels the charging circuit wire going to the alternator.
Unforfunately, most of the GM manuals I have seen show only the warning light circuitry and not the ammeter. I have created an Autocad drawing that shows how I believe the original wiring was done. I have used this diagram as a guide to solve amp gauge woes on several vehicles. I can e-mail it to anyone who would like to see it.

I am planning on converting the drawing to an image file so I can post it. As it stands now, it does not convert to scale quite right and it is difficult read as an image file, but it looks good with an Autocad viewer.

Sorry for the longwinded message.

Let me know if you want the .dwg file.

Darrell

Vlad · 02-01-2004, 07:19 PM

Thanks for all of the suggestions and tips. Turns out it was the simplest of all probs. I just didn't realize that there are fuses in the small acorn shaped connections that run from the battery to the regulator. thanks (Jhow66)

DaHateTank · 02-01-2004, 08:13 PM

Darrell,

Please send me the .dwg you have made.

I have converted my POS to a one-wire setup, and the amp guage is way screwy. (I know Ive bypassed the shunt) Perhaps your drawing will help me figger out how to modify it, so it works for my setup.

dahatetank@yahoo.com

Thank you.
-Marty

Fruitloops · 02-04-2004, 08:58 AM

Could you please send me the file? I have the same problem.
fruitloops@charter.net

01-27-2004, 02:18 PM	#1
Vlad Registered User Join Date: Feb 2003 Location: L.A. Ca Posts: 43	Electrical Help with "72" Jimmy I hope someone can help me .... I have a 72 Jimmy that I can't seem to get the dash Voltage gauge to work. Does anyone happen to have a wiring schematic they could email me. This would help me a great deal to possibly trace the wiring problem. I have tried replacing the the gauge with no success,and i am getting voltage on one side of the gauge. Any help would be appreciated please email to: cvladski@aol.com Thanks.. Vlad

01-27-2004, 03:08 PM	#2
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Check your fuses .(not in fuse panel) One is near battery-small black wire with a fuse holder inline (4amp)-it then goes to other side near voltage reg. where there is another just like it. Hope this helps. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

01-31-2004, 04:43 AM	#6
SS55 Registered User Join Date: Nov 2003 Location: San Diego, CA Posts: 62	Electrical Help with "72" Jimmy I have had to troubleshoot and repair quite a few of the 67-72 style factory ammeter setups. The ammeter is a shunt circuit that basically parallels the charging circuit wire going to the alternator. Unforfunately, most of the GM manuals I have seen show only the warning light circuitry and not the ammeter. I have created an Autocad drawing that shows how I believe the original wiring was done. I have used this diagram as a guide to solve amp gauge woes on several vehicles. I can e-mail it to anyone who would like to see it. I am planning on converting the drawing to an image file so I can post it. As it stands now, it does not convert to scale quite right and it is difficult read as an image file, but it looks good with an Autocad viewer. Sorry for the longwinded message. Let me know if you want the .dwg file. Darrell __________________ Be wary of the light at the end of the tunnel....It might be a gorilla holding a flashlight! 71 Blazer, ex-4WD...Bought it that way 55 GMC 55 Belair 2dr HT 67 El Camino

02-04-2004, 08:58 AM	#9
Fruitloops Registered User Join Date: May 2003 Location: Texas Posts: 34	Could you please send me the file? I have the same problem. fruitloops@charter.net __________________ '72 GMC 2 wd Jimmy '02 Toyota 4Runner (daily driver) '84 Chevy Silvarado short-bed (my boy's future truck) '71 VW bus buried in the back yard for my boys clubhouse!

01-28-2004, 03:27 PM	#3
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Every one of these trucks I've ever seen, that guage was dead. It may actually be the guage and not your wiring. Brian

01-29-2004, 11:27 AM	#4
pound41 Registered User Join Date: Dec 2002 Location: Northern Virginia Posts: 1,267	The one in my 70 blazer is dead like yours but the one in my 71 blazer works great. start it up for the first time in a hile and it jumps up there then settles back down. But my 70 I cannot get to to work let me know if anyone figures this out. Had the same problem with a 75 put in a new guage/printed circuit and still got nothing

01-29-2004, 01:39 PM	#5
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Here is a link to wiring diagrams. Jim http://www.geocities.com/chevroletc1070/wiringdias.html

02-01-2004, 07:19 PM	#7
Vlad Registered User Join Date: Feb 2003 Location: L.A. Ca Posts: 43	Thanks for all of the suggestions and tips. Turns out it was the simplest of all probs. I just didn't realize that there are fuses in the small acorn shaped connections that run from the battery to the regulator. thanks (Jhow66)

02-01-2004, 08:13 PM	#8
DaHateTank Registered User Join Date: Aug 2002 Location: Iowa Posts: 119	Darrell, Please send me the .dwg you have made. I have converted my POS to a one-wire setup, and the amp guage is way screwy. (I know Ive bypassed the shunt) Perhaps your drawing will help me figger out how to modify it, so it works for my setup. dahatetank@yahoo.com Thank you. -Marty



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