Amp gauge - The 1947 - Present Chevrolet & GMC Truck Message Board Network

stepside454 · 03-20-2004, 10:35 PM

The Amp gauge hasnt worked in my 75 C-15 since I bought it.
How do you go about checking to see if its aproblem with the gauge, or something else?
Also, to my knowledge, nobody offers a replacement amp gauge for our trucks. If it i a bad gauge, anyone know where to buy a new one ?
Heather, if you see this, Im the guy who suggested silver gauge overlays. I noticed that you include an overlay for voltage, but not Amp. Im not sure when they switched to Voltage gauge from Amp, I know both my 76 & now my 75 have Amp gauges.
Any help greatly appreciated. john

NeCrOmAnCeR · 03-20-2004, 11:50 PM

Check the two fuses in the engine compartment wiring harness. One on each side. The fuses are about 1/3 the length of a normal automotive fuse and set in a rubber plug. These form part of the shunt network that the ammeter uses. If you have problems locating them I can try to get a picture of them for you.

TIMSPEED · 03-20-2004, 11:55 PM

Quote:

Originally posted by NeCrOmAnCeR
Check the two fuses in the engine compartment wiring harness. One on each side. The fuses are about 1/3 the length of a normal automotive fuse and set in a rubber plug. These form part of the shunt network that the ammeter uses. If you have problems locating them I can try to get a picture of them for you.

Could you please, because I don't think my ammeter works either. It's always just sitting directly in the middle.

stepside454 · 03-21-2004, 12:05 AM

Necro, cool, Ill try to find em, but a pic might be nice. Thanks John

TIMSPEED · 03-21-2004, 12:10 AM

John, they're both right by the master cylinder. One of the plugs, comes off of that little junction box that's bolted to the firewall (It's above and to the passenger side, of the master cylinder.) The other, comes out of the main harness plug, which is directly below and to the passenger side of the windshield wiper motor.
I just checked both of mine, and both were good..so the ammeter doesn't work for some OTHER reason...

stepside454 · 03-21-2004, 12:25 AM

Tim, thanks, I just went out & checked both of those...both are good. john

TIMSPEED · 03-21-2004, 12:30 AM

Quote:

Originally posted by stepside454
Tim, thanks, I just went out & checked both of those...both are good. john

Hmm..well, if you stumble across the root of the problem, let me know so I can fix mine too! hahaha

stepside454 · 03-21-2004, 11:43 AM

I have a digital multimeter. If I knew what the heck I was doin with it ofr checking amps, Id try it in the socket where the amp gauge goes. John

rolson1039 · 03-21-2004, 08:44 PM

page 49 of the LMC catalogue has two different amp guages depends on which one ya want

03-20-2004, 10:35 PM	#1
stepside454 Registered User Join Date: Nov 2003 Location: st. louis area Posts: 1,551	Amp gauge The Amp gauge hasnt worked in my 75 C-15 since I bought it. How do you go about checking to see if its aproblem with the gauge, or something else? Also, to my knowledge, nobody offers a replacement amp gauge for our trucks. If it i a bad gauge, anyone know where to buy a new one ? Heather, if you see this, Im the guy who suggested silver gauge overlays. I noticed that you include an overlay for voltage, but not Amp. Im not sure when they switched to Voltage gauge from Amp, I know both my 76 & now my 75 have Amp gauges. Any help greatly appreciated. john __________________ 75 GMC C-15 short/step factory 454, lowered

03-20-2004, 11:50 PM	#2
NeCrOmAnCeR Registered User Join Date: Feb 2004 Location: Hodgenville, Ky Posts: 735	Check the two fuses in the engine compartment wiring harness. One on each side. The fuses are about 1/3 the length of a normal automotive fuse and set in a rubber plug. These form part of the shunt network that the ammeter uses. If you have problems locating them I can try to get a picture of them for you. Last edited by NeCrOmAnCeR; 03-20-2004 at 11:52 PM.

03-21-2004, 12:05 AM	#4
stepside454 Registered User Join Date: Nov 2003 Location: st. louis area Posts: 1,551	Necro, cool, Ill try to find em, but a pic might be nice. Thanks John __________________ 75 GMC C-15 short/step factory 454, lowered

03-21-2004, 12:10 AM	#5
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	John, they're both right by the master cylinder. One of the plugs, comes off of that little junction box that's bolted to the firewall (It's above and to the passenger side, of the master cylinder.) The other, comes out of the main harness plug, which is directly below and to the passenger side of the windshield wiper motor. I just checked both of mine, and both were good..so the ammeter doesn't work for some OTHER reason... __________________ I have a few cars... See Them Here

03-21-2004, 12:25 AM	#6
stepside454 Registered User Join Date: Nov 2003 Location: st. louis area Posts: 1,551	Tim, thanks, I just went out & checked both of those...both are good. john __________________ 75 GMC C-15 short/step factory 454, lowered

03-21-2004, 11:43 AM	#8
stepside454 Registered User Join Date: Nov 2003 Location: st. louis area Posts: 1,551	I have a digital multimeter. If I knew what the heck I was doin with it ofr checking amps, Id try it in the socket where the amp gauge goes. John __________________ 75 GMC C-15 short/step factory 454, lowered

03-21-2004, 08:44 PM	#9
rolson1039 Registered User Join Date: Oct 2002 Location: NJ Posts: 404	page 49 of the LMC catalogue has two different amp guages depends on which one ya want __________________ so many trucks so little time!!!



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