dwygant71 Posted May 7, 2012 Share Posted May 7, 2012 Ive never seen any thing like this ... i have a 1975 280z ... runs excellent... the wiring is confusing me... it will always make a strange buzzing sound and the lights ( all of them ) will go dim ...not off...then pop back on.. get brighter and brighter then go dim for a second it does this every 20 seconds then repeats.. it does this all the time... weather the lights are on or not ..it always make a buzzing sound like a relay is trying to kick on.. then stops but it does affect the lights ...nothing else... has anyone had this problem ? Quote Link to comment Share on other sites More sharing options...
dwygant71 Posted May 7, 2012 Author Share Posted May 7, 2012 Ive never seen any thing like this ... i have a 1975 280z ... runs excellent... the wiring is confusing me... it will always make a strange buzzing sound and the lights ( all of them ) will go dim ...not off...then pop back on.. get brighter and brighter then go dim for a second it does this every 20 seconds then repeats.. it does this all the time... weather the lights are on or not ..it always make a buzzing sound like a relay is trying to kick on.. then stops but it does affect the lights ...nothing else... has anyone had this problem ? on a side note it has a new alt.. batt.. headlights..ign switch..and no radio Quote Link to comment Share on other sites More sharing options...
dexter72 Posted May 7, 2012 Share Posted May 7, 2012 Have you checked the Battery, voltage regulator Alternator and or charging system?. If it does this as often as you say, a voltage test may help tell you whats going on. Make sure all the connections are clean of corrosion and tight. I would start with those and then get back to us with your results. Quote Link to comment Share on other sites More sharing options...
dwygant71 Posted May 7, 2012 Author Share Posted May 7, 2012 Have you checked the Battery, voltage regulator Alternator and or charging system?. If it does this as often as you say, a voltage test may help tell you whats going on. Make sure all the connections are clean of corrosion and tight. I would start with those and then get back to us with your results. voltage is constant 12 to 15 drops off to about 3 for a second or so about every 20 seconds new batt and alt... clean conections i think its a relay? Quote Link to comment Share on other sites More sharing options...
KillerBjt Posted May 7, 2012 Share Posted May 7, 2012 Sounds like the alt that you got is defective, take it to a parts store(kragen, O'reilly, autozone) have them test the alt. Really does sound like the voltage regulator is bad. Quote Link to comment Share on other sites More sharing options...
dwygant71 Posted May 7, 2012 Author Share Posted May 7, 2012 Sounds like the alt that you got is defective, take it to a parts store(kragen, O'reilly, autozone) have them test the alt. Really does sound like the voltage regulator is bad. its all new.. it did this with the old alt too... something is trying to kick on? its not the alt... sounds the ac trying to kick in or something Quote Link to comment Share on other sites More sharing options...
Challenger Posted May 7, 2012 Share Posted May 7, 2012 Ac coming on shouldn't drop it down to 3V. That's a huge drain. Does the engine bog down when it goes down to 3v? Quote Link to comment Share on other sites More sharing options...
dwygant71 Posted May 7, 2012 Author Share Posted May 7, 2012 Ac coming on shouldn't drop it down to 3V. That's a huge drain. Does the engine bog down when it goes down to 3v? yea it does a little... not bad ...it won't kill the motor ..it makes it flutter a little ... its timed every twenty seconds or so... it will buzz then stop and be fine ... the ac isnt even hooked up Quote Link to comment Share on other sites More sharing options...
dwygant71 Posted May 7, 2012 Author Share Posted May 7, 2012 yea it does a little... not bad ...it won't kill the motor ..it makes it flutter a little ... its timed every twenty seconds or so... it will buzz then stop and be fine ... the ac isnt even hooked up Quote Link to comment Share on other sites More sharing options...
KillerBjt Posted May 7, 2012 Share Posted May 7, 2012 An engine bay picture would probably be more helpful. Quote Link to comment Share on other sites More sharing options...
dwygant71 Posted May 7, 2012 Author Share Posted May 7, 2012 An engine bay picture would probably be more helpful. Quote Link to comment Share on other sites More sharing options...
dwygant71 Posted May 7, 2012 Author Share Posted May 7, 2012 ok i started pulling fuses second one from the top on the right ... if your looking at it from the drivers seat... it quit... and everything still works...I have no panel what is that fuse? Quote Link to comment Share on other sites More sharing options...
NewZed Posted May 7, 2012 Share Posted May 7, 2012 Pretty sure that there's a diagram in the electrical section of the FSM. If no one comes through with the easy answer. Quote Link to comment Share on other sites More sharing options...
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