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Username Post: Purchased 1980 GMC Sierra Questions        (Topic#367463)
brigdeja 
Poster
Posts: 61

Age: 33
Loc: New York
Reg: 03-03-09
01-15-22 06:07 PM - Post#2834601    

I just bought a 1980 GMC Sierra C15, fairly decent condition, a truck that I can tinker with and still drive. This is the first square body that I have owned and the oldest vehicle I have owned. I have a couple questions I’m hoping someone can help me with.

1. When I pull the headlight knob away from the dash, both square lights and both small lights under the square ones illuminate. When I press the floor switch, the top square lights turn off. Is this what should happen? I’m trying to understand what lights should be on for low beams and high beams. The bottom smaller lights look to me to be parking lights.

2. How many radio speakers did this truck have originally? I’m trying to figure out if speakers behind the seat are original or not.

3. How do you turn on the radio in these trucks?



 
Tony1963 
Frequent Contributor
Posts: 1303

Loc: Orlando Florida
Reg: 07-09-18
01-16-22 07:14 AM - Post#2834626    
    In response to brigdeja

1. When I pull the headlight knob away from the dash, both square lights and both small lights under the square ones illuminate. When I press the floor switch, the top square lights turn off. Is this what should happen? I’m trying to understand what lights should be on for low beams and high beams. The bottom smaller lights look to me to be parking lights.

2. How many radio speakers did this truck have originally? I’m trying to figure out if speakers behind the seat are original or not.

3. How do you turn on the radio in these trucks?


From what I recall, an 80 model has two headlights, either round or square. The quad headlights came later.

Most had a single speaker, but you could option more.

The left radio button twist to the right is on/off.



 
wagonman100 
Site Ambassador
Posts: 15597

Loc: Baltimore, MD
Reg: 11-27-04
01-16-22 09:03 AM - Post#2834634    
    In response to Tony1963

Pull the headlight switch out to the first position. That is the running light position and only the running lights illuminate. As said, you should only have two headlights. So if they go out when you use the high beam switch, the headlights are burned out. Are the lit when the high beam indicator on the instrument panel is lit up? It’s likely that the low beams burned out and the previous owner was using the high beams instead of replacing the lights.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25720
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-16-22 01:03 PM - Post#2834650    
    In response to wagonman100

Three speakers are possible. One center dash and two cab corner speakers. Most owners upgrade the cab corners to 6X9 speakers. The dash to 4X10. Round or square headlights are possible. The stacked quads started in '81.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
brigdeja 
Poster
Posts: 61

Age: 33
Loc: New York
Reg: 03-03-09
01-17-22 05:11 PM - Post#2834739    
    In response to gchemist

Thanks. I appreciate the help. I’m looking forward to working on and enjoying this truck.



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25720
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-18-22 04:48 AM - Post#2834757    
    In response to brigdeja

Welcome to our addiction!
Go here to read and see custom modifications possible for your truck.
http://www.73-87.com/


'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
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