Radio Install - wiring question

[jcc911]

Hey guys, I am just about to install a Becker cr-220 into my 78 SC and have a couple of questions. I have seemed to located a constant power and an switched or ignition on power line. According to the becker manual, I have three wires that i am questioning.
1. Permanent +
2. Switched +
3. Illumination.

I guess 1 and 2 are pretty self explanatory from the testing I did with a volt meter as to which wires those were, but my question is, where do I splice the illumination wire into?

Second are the rear speakers set up as mono, because I have only found one set of wires that appear to be for the rears.

Thanks

[jetstar911]

Permanent (memory) goes to a 12v constant source.
Switched (ignition)iis your turn on lead. You needa12volt switched power lead.
The Illumination goes to the dimmer from the park light swith. Or you can use the parklight circuit to feed that wire. Either way the display of the radio is meant to dim with the dash lights. You can leave it disconnected to keep it "fixed or hook it up to be "variable". Some people leave it disconected. All thoes wires should be located in the factory harness. Always bench test the radio before instaling into yout vehicle.

[Tidybuoy]

For my car, I pulled the bulb fixture off the top of the ashtray and added a dual spade (not sure if that's what it's called but it basically clips onto an existing spade and turns it into two spades). Then I plugged back in the ashtray light and the illumination wire from the stereo.

Vern

[jcc911]

Hey Vern, good idea, thanks.

How do I bench test?

[jetstar911]

If you dont a 12v power supply, use a car battery on your work bench. Make sure to fuse your circuits between the radio and battery before conecting the wires. Test benching the radio is a great way to figure out if the radio is working before installing it into the car. Way more work trying to trouble shoot the radio while installed in your car.

[jcc911]

Would you happen to have a pic or digram of how to do that, thanks.

[jetstar911]

Its real simple. Find a battery, hook up the deck like you would in your car but on a work bench. Hook up both power leads and ground, then the deck will turn on. Check the radios functions and make sure the deck works fine. Use an old speaker you may have and connect the speaker leads one at a time to make sure you have sound. If that works out, you now know the deck is in working order and ready to be installed into the car. If the deck is working on your bench and not in your car then there is something installed or improperly conected somewhere. Yes, you can just use a regular car battery to test with. ( see the power and ground at the battery?)

[pioneer1]

The original stereo probably analogue-used a common ground.You will need to instal another pair of wires to the rear deck speaker from the new stereo.

[jcc911]

Thanks All!
Seems pretty straight forward.

Best Regards, Jeremy

[jcc911]

Hey jet, you mention to fuse the circuit. How did you do that, want to make sure I do that before hooking it up to a car battery, thanks.

[jetstar911]

wire a fuse holder in-line of the 12volt leads to protect the unit. Use 10-15 amp fuses to be safe.

[jcc911]

Got it thanks.