1900 SR Sterio replacement

[Lawiswar]

How did you guys get on with the wiring? There don’t seem to be sufficient wires on the back of the old unit???

[Lawiswar]

Hi all,
I’ve managed to remove the old radio on my 1900 as it was dead. It was the 2 pot style.
I removed the areal cable and cut the rest but there don’t seem to be enough wires to match a modern wiring harness. In particular I can’t see that there are two wires for each of the two speakers.
Has anyone got a wiring diagram or the ability to tell me how to wire it?
Thanks in advance,
David

[jrsick]

So you are installing a new head unit, and there are more wires coming out of the head unit than you know what to do with?
Since there are two speakers, you will need to wire them to either the front right/left or rear right left wires on your head unit. You will need to ground the unit, probably the black wire is ground, and you will need to power the unit, and that is likely the red wire. The yellow wire is usually the saved settings, and you will need to wire that to a constant 12vdc if you want your settings saved when you turn off the head unit.
Does this get close to answering your question?

[mcoffey]

Errrr, sorry, has been quite a few years since I did this. I do not remember any issues though. The new stereo has some extra wires that are not needed in this application, such as an Amp trigger wire, electric antenna wire, etc...I just used the Switched Power, Battery, Ground and the Speaker Wires. I also think I changed the Switched Power to be supplied off a spare rocker switch in the dash, one that was not used for anything, so now I turn on with that spare rocker. Attached is the wiring diagram I had for my model, hopeful it is similar and helps with yours.

[Lawiswar]

My main confusion is that there doesn’t appear to be a pos and a net for each speaker. You normally have a green wire for say front left pos and a green with a black stripe for front left neg (I might have designated the wrong speaker there). I’m starting to wonder if the simplest solution is new speakers.

[mmwjr]

Some setups use a common neg that all speakers connect to. The new stereo should have a wiring diagram so you know that end. What is the list of wires by color on the boat side and can you post a picture of the new stereos wiring diagram?

[jrsick]

There are two ways I know to test speaker polarity. If you can actually see the connectors on the speaker itself, the larger spade is the positive. There is also the battery test: get a round "C" cell battery and hold one wire to the positive end and hold the other wire to the negative. Look at the speaker cone while doing this. If the speaker cone moves away from the speaker magnet then you have correct polarity. If the cone depresses towards the magnet then you have reversed polarity.

[shrew]

There is usually a map or wire labels on the old stereo. I usually mark the wires then do one at a time. Each speaker has a pos/neg set obviously. There should be two power connections (one for power and one to hold the memory). The rest are for amps, antennae, remote and other features. There are commonly many unused cables on the new stereo during an install.

[shrew]

Posts from duplicate thread merged into this thread.

[Lawiswar]

I can’t seem to manage to post w photo but the wires are:
Antenna
Red
Yellow
Indigo
Black
Blue
Green
Brown

That is it. No map or wiring diagram on the radio or anywhere else I can find.

[shrew]

How many speakers on the boat?

[Lawiswar]

Two speakers

[jrsick]

what is make and model of the head unit?
It looks like you have just enough wires for two speakers.
Do you have a multimeter?

[Gugi47]

You just use the two pair for the front or the rear.
I have only two speakers on my boat to.
And I replace it last month.
I use the two front pairs and works great
Good luck

[mmwjr]

Originally Posted by Lawiswar

I can’t seem to manage to post w photo but the wires are:
Antenna
Red
Yellow
Indigo
Black
Blue
Green
Brown

That is it. No map or wiring diagram on the radio or anywhere else I can find.

Are these the wires on the new or old stereo? What are the colors from what you didn’t provide?

What is the brand of the old and new stereos?

[mmwjr]

Well I can tell you Red is switched power that should be provided by an accessory switch, Yellow is memory power that gets wired by fuse to the battery and black is DC ground.

[Lawiswar]

I finally got to the boat to check the make of the old stereo. It’s prestige by audiovox. P10b.