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6/8/13 6:13pm - Original Message: 'Delco radio wiring'
BigShoes16
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Worcester, MA - USA

Vette(s):
75 L-82 Coupe 4-spd

Joined: 2/25/2013
Posts: 52
Hey guys, Jim again.
Trying to get my 75 delco radio (Model - 9344661) wired correctly to see if it works.
The previous owner made a heck of a mess out of the wiring and I'm attempting to clean it up.
Need some help wiring the speakers.  There's a plug coming out the back with a blue, black and green wire as pictured below - 



This was connected to the speaker wires but they were not working so I'm thinking they were connected incorrectly.  Does anyone know which colors go to which speakers?

Thanks,
Jim


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6/8/13 8:35pm - Reply: 'Re: Delco radio wiring'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19448
Without looking at a diagram(if one even exists), I would say the black is the common ground, blue is left, green is right.
Sometimes, GM radios have a wiring pin-out stamped on the cover of the radio....have you looked for that? Not all have it, but ya never know...


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Joel Adams
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6/9/13 1:19am - Reply: 'Re: Delco radio wiring'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 829
I've done extensive wiring with my original deco so I should remember but I don't. I do seem to remember there being a plug like that for each speaker but with only two wires each. I also remember a light green and a dark green. Is this a stereo radio or mono? Also it looks like the picture shows the convector (thing that looks like an external amp). Is that all intact and wired correctly? That would probably cause the speakers to not work if there were problems with it or it was missing. I agree with Joel though - definitely look on the radio for some stamped info on the connection details. Good luck!

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1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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6/9/13 12:57pm - Reply: 'Re: Delco radio wiring'
rraider1
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Woodland, WA - USA

Vette(s):
1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion

Joined: 10/14/2003
Posts: 1152
Not sure of exact year but this diagram shows mono and stereo and should give you something to go by
 
 
Here is some other info I found doing some searches online
 
 

75 came with either a mono or stereo radio. If there is only one of the "convectors" then it's mono.

 

A mono radio has three wires going to one convector while the stereo radio has six wires going to two convectors. The convector wires are Yellow-Blue-Green. Both radios have a three wire bundle for speakers...black for speaker grounds and a light green for the right speaker and dark green for the left speaker. There is also another three wire bundle: gray ties in with your parking lights to light the radio dial when you turn on your lights, black goes to chassis ground, and yellow goes to fuse box for +12V power.

 

Convector wires are green, yellow, and blue. If the connectors are cut off it will be impossible for you to tell the difference between a green speaker wire or the green convector wire. Turn the radio upside down and remove the bottom. The green wire to the convector connects to a terminal strip at the very furthest connection point (closest to the top of the radio). Or bottom connection as you are looking at it upside down. The green speaker wires are on separate terminals closest to the bottom of the radio.

The speaker wires are black (common to both speakers) and 2 greens. It really doesn't matter which green goes to which speaker as it is a MONO radio.

Use only 10 ohm speakers or you will cause severe damage to the radio. Most modern radios use 4 ohm speakers, so be careful.



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Bob R
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6/10/13 10:42pm - Reply: 'Re: Delco radio wiring'
BigShoes16
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Worcester, MA - USA

Vette(s):
75 L-82 Coupe 4-spd

Joined: 2/25/2013
Posts: 52
Outstanding help as always, thank you all very much. My radio is the stereo model but no wiring diagram is stamped on the unit. With the info you all provided I managed to get the speaker wired up only to discover the paper cone was torn apart. The wire leads were completely separated from the cone. So now I'm trying to figure which way to go, find someone to repair/replace the original speaker or replace entire system with new equipment. The rest of the car is 90% original and I don't know enough about what retains and what destroys value. Any ideas which way to go?

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6/11/13 3:35am - Reply: 'Re: Delco radio wiring'
daveo76
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Vancouver, WA - USA

Vette(s):
1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.

Joined: 8/25/2005
Posts: 829
You could do what I did: on each of the two channels, I wired two decent quality modern 4 ohm speakers together in series, not in parallel as is typical for speakers.  In series, the resistance ratings add together so I have 8 ohms per channel now which is probably close enough to the 10 ohm factory speakers.  (Haven't had any problems and I've had it this way since last summer)  In each of the pairs of speakers I kept one in the original dash location and then added another in the back - added bonus.  I think it sounds pretty good, definitely better than with the just two mediocre quality speakers in the dash.  I also added in a wired FM modulator so I can play an Ipod through the original head unit.  More info (and a you tube vid) in this post.  



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1976 Silver/Firethorn.  L48, 4spd.  Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.
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