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Username Post: gauges and speedo        (Topic#348938)
bobm94 
Forum Newbie
Posts: 3

Reg: 12-31-17
12-31-17 03:29 PM - Post#2719562    

Recently got a 94 GMC 1500..350..Gauges fluxuate and when sitting still..with the engine running the speedo jumps up almost like a tach..gauges also move when the turn signals are flashing...think ground problem? or is this a common problem with that year? Also the odometer does not work..Help



 
CowboyTrukr 
"7th Year" Silver Supporting Member
Posts: 3968
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
12-31-17 03:46 PM - Post#2719566    
    In response to bobm94

Welcome to ChevyTalk, Bob.

No, this is not a common problem with the '94.

Check the grounds. There's one at the fender by the battery, one on the opposite fender attached to the core support.

Also, from the back of the passenger head to the firewall and down to the frame by the starter.

Additionally, three or four on the intake including the main negative, two at the water neck, and one or two behind the alternator.

There should be one near the OBD1 connector under the dash.

The voltmeter will bounce a little when signalling.

Make sure your batter cables are clean and tight.

It's not unusual to see corrosion develop inside the post covers on the battery cables. Carefully roll the red and black covers back and examine the stranding.

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
bobm94 
Forum Newbie
Posts: 3

Reg: 12-31-17
12-31-17 03:53 PM - Post#2719567    
    In response to CowboyTrukr

Thank you..thinking ground myself since there was an after market radio installed..they may have robbed the ground from the insturment wiring..kinda funky install from what I've seen so far..only had the truck about two weeks..



 
CowboyTrukr 
"7th Year" Silver Supporting Member
Posts: 3968
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
12-31-17 04:06 PM - Post#2719569    
    In response to bobm94

Did they use the factory dash adapter and wiring harness?





Attachment: radio.PNG (166.29 KB) 66 View(s)

Greg

'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
runamukker 
Poster
Posts: 46

Reg: 01-01-18
01-01-18 05:58 PM - Post#2719720    
    In response to bobm94

Had same problem when I replaced the dash on my '92. Previous owner had cobbled radio harness, when I uncobbled the harness
the gauges went wild until I found an unattached power wire that went to radio harness. Problem went away after splicing wire
to where it belonged.

'92 K1500 Blazer Z71 350TBI 700R4 , 253,000 miles
'94 C1500 Cheyenne WT 350TBI 4L60e , 565,000 miles


Edited by runamukker on 01-01-18 05:59 PM. Reason for edit: No reason given.

 
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