Need Radio Installation Help, Please!, Have an original to install... Options

[orthobiz]

My 1974 came with a junkie Kenwood CD player that skips over every bump. I have a radio that came out of a 1975 914 but need advice please on installation. The Kenwood has a proprietary plug connected to a bunch of wires, maybe 7 or 8. I suspect the original Porsche wiring is cut to fit into the special plug that goes into the back of this monstrosity.

In looking at the original Blaupunkt radio, I only see 4 wires and a hole for the antenna connector. Wouldn't each speaker need two wires (total 4), a 12V hot wire and a ground for a minimum of 6? What's with the special plug coming out of the radio: is it only one of two speaker connectors (like the other one is missing?).

Any help is appreciated.

Paul

[Mike Bellis]

That radio was made before the switch to floating speaker grounds. The speaker negative could be the vehicle chassis unless it is a mono unit. It it is mono, there is only a single speaker channel and your funky connector could be both positive and negative speaker leads.

[orthobiz]

That radio was made before the switch to floating speaker grounds. The speaker negative could be the vehicle chassis unless it is a mono unit. It it is mono, there is only a single speaker channel and your funky connector could be both positive and negative speaker leads.

Then it's gotta be mono. I'm SURE it would say "Stereo" on it otherwise, no? Shouldn't be any harm in splitting the signal from that dual connector then, one positive and one negative wire sent to each speaker then.

Paul

[Mike Bellis]

That radio was made before the switch to floating speaker grounds. The speaker negative could be the vehicle chassis unless it is a mono unit. It it is mono, there is only a single speaker channel and your funky connector could be both positive and negative speaker leads.

Then it's gotta be mono. I'm SURE it would say "Stereo" on it otherwise, no? Shouldn't be any harm in splitting the signal from that dual connector then, one positive and one negative wire sent to each speaker then.

Paul

If it is mono, you will damage it if you wire the speakers in paralelle. You need to wire them in series. For a series circuit, Left speaker positive to radio. Left speaker negative to Right speaker positive. Right speaker negative to radio. This will double the speaker impeedance and protect the amplifier circuit. If they are wired in paralelle, it will half the load and burn out the radio.