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Registered
Join Date: Feb 2018
Posts: 24
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Fuse Out - Why does radio and clock STILL work w/ ignition on?
Hi. I pulled fuse #4 which I thought would completely disable the clock and radio; however, when I turn the ignition on they both receive power and operate. I am curious as to why and if it is normal? I have attached a few pictures with the yellow 5amp fuse removed and one can see, there is a metal jumper bar going from fuse #2 to #3, and one from #3 to #4. The radio and clock do not operate when the ignition is off with #4 removed, and it is clear that when the ignition is off the radio is not getting any power as the radio's theft light does not function and it codes out each time the car is turned off. (I did not take note if interior lights behaved similarly.) I had originally pulled the fuse since I was putting the car away for five weeks and wanted to reduce the ambient amp pull of the clock and radio, but forgot to pack a wrench to pull the negative battery terminal. The 911 is a stock 89 Carrera 3.2 and everything works as designed. Thanks for any input.
 
Last edited by 1989carrera911; 07-21-2018 at 04:49 AM.. Reason: Add word “still” to title line |
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07-20-2018, 05:33 PM
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Join Date: Feb 2018
Posts: 24
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Bump; can anyone help with the above?
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07-23-2018, 08:06 AM
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Registered
Join Date: Feb 2006
Location: Ontario Canada
Posts: 2,947
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why not just get a "green knob" .... makes life a lot easier..
clock and radio should just be about 15ma anyway.
__________________
1976 Yamaha XS360 ( Beats Walkin') 1978 911 SC Targa ( Yamaha Support Vehicle ) 2006 Audi A4 2.0T (Porsche Support Vehicle ) 2014 Audi A4 2.0T Technik (Audi Support Vehicle) |
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07-23-2018, 09:33 AM
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Registered
Join Date: Dec 2002
Location: So Cal and So Oregon
Posts: 2,181
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I don't have my resources near me, but I did a search on a similar year car as your and the radio is powered both by the 15 bus and the 30 bus. This means one connection is hot all the time and one is switched through the Run/Start positions of the key switch.
My info source: https://rennlist.com/forums/911-forum/869781-radio-wiring-diagram-89-911-targa-3-2l.html I am guessing the clock has two power sources going to it too. One for the lights inside. Last edited by SpyderMike; 07-23-2018 at 07:29 PM.. |
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07-23-2018, 07:09 PM
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Registered
Join Date: Jun 2009
Location: Manhattan Beach, California. Factory Delivery-Original owner-Retired engineer
Posts: 5,238
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Radio.
If it might help, I have the factory manual for the M/Y 86.
Gerry
__________________
1986 911 Targa. Per Road and Track magazine: Only in L.A.: In the window of a bar in Hermosa Beach, California. "Happy Hour prices during all car chases." |
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07-24-2018, 06:19 AM
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