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If your CR -814 came from a '91 940, it probably has : 1. an antenna connection, similar to your other radio, 2. the round 6-pin din connector for the amplifier, and 3. a 14-pin offset rectangular connector to the vehicle harness. Your '86 740 would have ordinarily had an antenna conector, the 6-pin din amp conneccotr, a 9-pin connector (with or without all the pins actually used), and several separate ground, power, and other single or double wires in addition.
Ther was a dealer-available adapter for retrofitting radios and other audio equipment from '88-92 to the earlier vehicles. Part number is here on the site somewhere--spend some time playing with the search function at the bottom right of the page. Or, if you have access to a junkyard, you can make your own.
Most of the Volvos from late '88 through mid '92 should have the 14-pin harness connectors under the dash--if you can get there, get both the connector for the radio and the connectors for the amplifier; they're different, but adaptable. Note that the '88 and later amps use a separate din cable, rather than the built-on cable in the pre-'88s. get as much wiring attached to the connectors as you can. And get the factory wiring diagrams for your car! They'll pay for themselves on this project, and save your butt many times on any future projects.
the pin-out designations for the 14-pin, both amp and head unit, are here on the board--use the search function. The 14-pin connectors have tiny numbers moulded in the plastic to make it easier.
The pin-out and other wiring descriptions for the pre-'88 radios are also somewhere on the board. Get out your pencil and start drawing your wiring after you print out the prior posts on these subjects.
Your '86 amp may be either 2- or 4-channel, depending on what the original owner wanted. If it's a two-channel, and you want to upgrade and rewire, you can substitute a 4-channel amp--same din connection, but obviously different output wiring.
The CR-814 is set up to run 2(fairly low power) channels for the dash speakers direct from the head unit, and 4 from the amplifier. Obviously the power of the latter four depends on the size of the amp. If you're at the junkyard scrounging wiring bits, look around for a 960 amplifier-these were 4 channels x 40 watts, and pretty good stuff. Get all the surrounding wiring if you find one of these amps. Otherwise, the amps from the 940s will fit the same 14-pin connector as the 960 amp, but the 940 amp is 4 x 20. Or, if you want to go to a vintage-appropriate dual amp setup with two 2-channel amps, email me.
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We have met the enemy and they is us. [Pogo] S70 T5 cop car : Rough Rider suspension, Walmart fog lights, eBay speakers, ambiance by Pall Mall, trim by Le Duc d'Tape, 8-channel THD by OEM amps
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