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Diodes on Head Unit’s Negative?
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<blockquote data-quote="MilitiaRobbo" data-source="post: 8752527" data-attributes="member: 683411"><p>Hey Everyone, Robbo here, from Australia.</p><p></p><p>I have been facing a hiss sound with my Nissan Patrol for months. I have taken it to multiple car audio installers and their complete failures owe me nearly $1,500AUD in labour fee’s.</p><p></p><p>To test the theory of it being a faulty head-unit, I took it out of the dash and dummied it straight to the positive and negatives of the under bonnet battery, I also dummied the park/remote wires and dummied a speaker (eliminating ignition, rca’s, amps etc), LO AND BEHOLD there was NO hissing sound, but SOON as I put the negative terminal back onto the battery the hiss comes back.</p><p>(Which would mean something is shorting on the ground of the vehicle?) </p><p>I cannot find the short (I presume it’s the vehicle immobilisation system given that it’s the only thing on while there’s no keys in the ignition) so my question is this; Can I instead just put an inline diode on the head units ground wire so that the current interference from the ground cannot pass into the head unit anymore?</p><p>Thanks everyone!</p></blockquote><p></p>
[QUOTE="MilitiaRobbo, post: 8752527, member: 683411"] Hey Everyone, Robbo here, from Australia. I have been facing a hiss sound with my Nissan Patrol for months. I have taken it to multiple car audio installers and their complete failures owe me nearly $1,500AUD in labour fee’s. To test the theory of it being a faulty head-unit, I took it out of the dash and dummied it straight to the positive and negatives of the under bonnet battery, I also dummied the park/remote wires and dummied a speaker (eliminating ignition, rca’s, amps etc), LO AND BEHOLD there was NO hissing sound, but SOON as I put the negative terminal back onto the battery the hiss comes back. (Which would mean something is shorting on the ground of the vehicle?) I cannot find the short (I presume it’s the vehicle immobilisation system given that it’s the only thing on while there’s no keys in the ignition) so my question is this; Can I instead just put an inline diode on the head units ground wire so that the current interference from the ground cannot pass into the head unit anymore? Thanks everyone! [/QUOTE]
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