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I have a 1975 IMP aztek boat that came with an 8-track (yes I said 8-Track).
I am installing a car receiver/cd player into it.
I have completed all the wiring but am having some problems with the operation.
The unit will come on but can get no sound. I have double checked my speaker connections also.
I suspect it is a grounding problem, but I am not sure how to correct.
Using a multimeter, I connected the hot wire and the ground wire(from old wiring) and got a 11.5V.
The ground wire is connected to the cd player housing and also is connected to the ground wire going into the unit.
The unit will shut off if the ground on the chassis is disconnected.
I realize that ground electronics on boats is a little different than on a car. Could you get me going in the right direction. Thanks -Jerry
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Jerry,
Use caution when connecting a new stereo. Most units are medium to high powered outputs and you cannot connect any of the speaker wires to the radio ground or chassis. If you do you will burn up the audio output amplifiers inside the stereo. Double check all your speaker wire connections and make sure that only one set of speaker wires go to each speaker. Also make sure that none are crossed connected. as long as your new stereo has two 12 sources and a good ground you are in the right direction. Use you multimeter on the ohms scale and measure the speaker wires (disconnected from the stereo) for about 8 ohms at each speaker wire. If the speakers are as old as the 8track, they me be defectice also. Please let me know what you find out.
TOM,
Tom,
I did replace the speakers with some that came with the new receiver.
The speaker wires are only connected to the receiver and are not grounded anywhere. I carefully installed the speaker wire, so I am fairly sure I connected them to the proper polarity.
The ground on the receiver itself is what I suspect to be a problem.
The unit will come on and the equalizer will show levels of receiving radio reception, but I can't get sound from speakers.
Should the ground wire be connected to the chassis on the receiver?
This is the same ground connected to the ground input on the wiring harness provided with the receiver.
I have experimented and the receiver won't come on when the chassis ground is disconnected.
I'm stumped.
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Jerry,
please give me the make and model number of your new CD stereo. I will look over the service manual for clues of what may be cause of the no sound problem.
TOM,
T&D ELECTRONICS
tdeser@zoominternet.net
Tom,
The cd player is a Sanyo ECD-T1137S.
Are the speakers supposed to have a separate ground possibly?
For instance car stereo speakers are usually bolted to the metal frame of a car, which would provide a ground.
In my boat the speakers are just screwed into a vinyl covered piece of wood under the dash.
Just an idea.
I have also tried grounding the cd player with a wire directly from the battery.
I have even exchanged the deck at one point to make sure it was not defective.
Thanks for your help, I have done radio installations before but never have I had a problem like this. -Jerry
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Jerry,
None of the speaker wires should be grounded! if any are, the amp in the stereo will burn up! I will get back to you ASAP.
TOM,
T&D
Tom,
None of the speaker wires are grounded. They are connected directly to the receiver. What I meant was is that since the metal frame of the speaker is not bolted to the metal frame of the boat
(like a car would be). Would that create the problem?
AnswerJerry,
No problem here, I install these marine speakers on fiberglass all the time, not having the speaker on a metal backing won't affect the operation of the stereo or the speaker. I'm working on the NO sound problem and I will let you know something as soon as possible.
TOM,
T&D
