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Old 04-07-2014, 10:12 PM   #1
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Question speaker wiring?

OK, so we are on our first trip of the season and another issue with my 36B4. This time my speakers in the LR are not working. So I took out the Jensen AWM 970 to see if something had come loose from the back. Looks like all my connections are solid, but I noticed that my 4 speakers were wired to just the "A" set of wires. However, after further investigation I see that FR wired them by taking the + right speaker wire and connecting it to just one positive and the - to the other right speaker. They then wired the + of one speaker to the - of the other speaker. Same with the left set of speakers. Is this right? I thought you would connect the + and - together and not cross them over? Would this cause the speakers to stop working? I guess it is like they are wired in "series" instead of "parallel" My speakers are small square ceiling speakers and I can't even figure out how to get the grills off to take them out... Hope this makes sense...
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Old 04-07-2014, 10:17 PM   #2
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that doesn't sound right. Speakers have to be independent of each other, not "in series". Might very well have something to do with your problem. Have to tried rearranging the wiring at the radio?
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Old 04-07-2014, 10:40 PM   #3
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Originally Posted by davel1971 View Post
that doesn't sound right. Speakers have to be independent of each other, not "in series". Might very well have something to do with your problem. Have to tried rearranging the wiring at the radio?
that is what I was thinking... can't figure out how to get the speakers out of the ceiling to test them...
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Old 04-07-2014, 11:02 PM   #4
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If I understand correctly, it's possible the way they wired it has damaged the radio. The trailer we just bought had the speaker wiring screwed up, but not to that extent. If you have the literature for the radio hopefully it shows how to connect it up, i.e. what color wire is right rear, front and so on.
If you have that you can start by disconnecting the speaker wires for the radio. To find out what speaker a wire goes to, simply use a 1.5 volt C or D battery and touch one pair of wires at a time to it. You'll hear the speaker make a small pop. Don't hold the wire to the battery, just a touch to make the noise. Then label the wire. If you have one that doesn't make any noise then there is a problem with the wire, the connection at the speaker, or with the speaker itself.
Good luck!
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Old 04-07-2014, 11:05 PM   #5
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Do you have a volt ohm meter (VOM)? You should get some resistance between paired wires probably either 4 or 8 ohms. If they have not wired the harness properly the paired wires will be one for speaker A and one for speaker B and the meter will read open or however it shows when the two leads are apart. You do not need to mess with the speaker heads, too much trouble and it could get you more grief than lake of tunes.

Another option would be to use a remote speaker plug to a radio or similar device and and connect/insert those wires to the wires for the harness. Don't worry about + and - they are conventions mostly but can affect the sound a little.
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Old 04-07-2014, 11:08 PM   #6
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It could actually be wired in series like this for a reason, but that depends on the ohm rating of each speaker and the minimum load impedance of the amp/stereo itself. If the speakers are 4 ohm each and the minimum load impedance of amp/stereo is 8 ohm, they would need to be wired in series to raise the overall impedance to the amp to prevent overheating or other problems. Unfortunately I cannot tell you what the setup should be as you really need to look at each speaker and understand the specifications of the amp/stereo itself.

I'd be careful about connecting all of the positive ends of the speakers to the positive wire on the stereo and the negative to the negative side (wire in parallel) as you will actually drop the impedance probably well beyond the capacity of the stereo's capabilities (again heat and potential failures) if it cannot handle the drop in ohms properly.

Do you have other speakers that are on B/C switches that work or do none of them work?
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Old 04-07-2014, 11:11 PM   #7
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Quote:
Originally Posted by Kenrod View Post
If I understand correctly, it's possible the way they wired it has damaged the radio. The trailer we just bought had the speaker wiring screwed up, but not to that extent. If you have the literature for the radio hopefully it shows how to connect it up, i.e. what color wire is right rear, front and so on.
If you have that you can start by disconnecting the speaker wires for the radio. To find out what speaker a wire goes to, simply use a 1.5 volt C or D battery and touch one pair of wires at a time to it. You'll hear the speaker make a small pop. Don't hold the wire to the battery, just a touch to make the noise. Then label the wire. If you have one that doesn't make any noise then there is a problem with the wire, the connection at the speaker, or with the speaker itself.
Good luck!
The method I used on mine to fix the wiring was to use a phone toner. http://www.amazon.com/gp/aw/d/B001MB...&pi=SY200_QL40
Disconnect all speaker wiring. Connect the alligator clips to a pair of speaker wires you will hear the tone sound at the correct speaker. Works great and you want damage the speakers.

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Old 04-07-2014, 11:21 PM   #8
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This link will get a guide if you don't have one. It also has a pinout so you can check the http://www.google.com/url?sa=t&rct=j...8,d.b2Iharness.
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Old 04-07-2014, 11:29 PM   #9
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Based on link it appears that the radio in there can go to a 4 ohm minimum load. If the speakers are 4 ohms, and you have 4 of them tied into the living room (A channel), they would need to be wired in series (similar to what you documented above) to stay above the minimum load of the amps capabilities. If they are 8 ohm speakers, they could actually be wired in parallel.
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Old 04-07-2014, 11:31 PM   #10
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I need to get one of the speakers out of the ceiling so I can check the ohm rating. Just don't want to tear the speaker up. they are small square flush mount speakers. I don't see any screws, so I assume they are under the grills. think I should just try to pry off the grills?

B speakers wires are not being used. just the A and C. C speakers are working.
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