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Administrator
1993 SL500, 1998 SL500 Pano Top, 2005 ML270Cdi.
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975 Posts
HI Glen, if you are not into electronics it's probably not an option for you to open and try to effect repairs.
They are not too expensive and I've just found some on eBay.ca new and used Here
 

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Administrator
1993 SL500, 1998 SL500 Pano Top, 2005 ML270Cdi.
Joined
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975 Posts
Thank you. I wasn’t planning on a repair - just replace if needed. My concern is if the amp is getting sufficient power to work (0.5V). If not, a replacement is a waste of money. I’m really looking to know what voltage I should be seeing.
Cheers
Glen you say the the fuse for the ant. amp. has power, what is the voltage at the fuse?
If it is the supply to the amp, then there should be 12v. at one of the amp terminals, is this correct?
 

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Administrator
1993 SL500, 1998 SL500 Pano Top, 2005 ML270Cdi.
Joined
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975 Posts
I just went and double checked. There is one very thin red wire/coupling into the amp as well as the 2leads to the glass antenna and the co-ax plugin. At the red power (?) lead I measured 0.5V with the radio on. Regardless, I’m concerned it’s supposed to be 12V. I’m thinking of running a 12V wire to the antenna amp to see if it’s any better.
I've been trying to find a circuit diagram of the comand system in the W164 without success, so I don't know what the input voltage is for the amplifier.
Before you take that step it might be prudent to ask here first.
 
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