Can I use an SD card to play music on memphis mp66 and if so, how do I get it to work?

Do you mean it plays some music or video but can't play other music or videos? If my understanding is right, you'd better check whether the card works on another phone. If it works, you can try installing a third-party player to your S5.
Good luck.

The MP66 can read microSD cards. Your 8GB card is actually a microSDHC card and will not work with the MP66. You need to use SD and microSD cards, 2GB and smaller.

You are having a grounding issue is what it sounds like to me. Remove the system and make sure that you have all the connections made properly and that no wires are touching. My Question on this too is does it get hot when the radio is turned on? Or will it get hot while the radio is turned off?

the radio will detect the sd card and then all you have to do is change the soure from the am/fm or cd/ aux to the sd card it will display the card on screen once it there and you will your controls just like working the cd when playing it .

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Here is the link to your manual

http://a248.e.akamai.net/pix.crutchfield.com/Manuals/023/023MEMMP66.PDF

To add music to your DSi, first you need a spare sd card, and a pc or laptop that can sync with the card. Remember that the DSi only plays AAC type songs, so convert the songs you want to copy-paste on the card. This can be done easily on Itunes on which I use by right-clicking on the song and it will show you there ' convernt to AAC'. After saving the songs , take out the card from the pc or laptop and you can now insert the card in your DSi and play music and enjoy.

you have to make sure that the music is in the right format and you have to open the music in the music player menu. i have my songs in wma format and they work fine. also if your phone is not recognizing the sd card then perhaps its an sd card that is not supported by the lg shine. read your manual there is a specific type of card you can and cant use on that phone. the card i have is a sandisk 4gb microSDHC

Try to check the SD card, switch the protector, then try to play it again by pressing play button 3sec (the indicator will turn into blue), then the music will play.

MUSIC
This menu needs to be supported by mini SD Card.
It plays the music stored in the mini SD Card.
Copy the downloaded music from PC to mini SD Card,
and play the music stored in the mini SD Card through
your mobile phone.
Store music in the mp3 folder on the SD card.
1. Press [MENU] .
2. Scroll through the downloaded music to display the
music you want.
3. Select the music you want to play then press
[PLAY] or press [MENU]. Then select “Setting”,
press [OK], then 1.All Repeat, 2.Repeat,
3.Random.
Press [OK].

• “mini SD Card” is connected to your phone, press

[MENU] to select 1. Setting, 2. Erase (Erase This/
Erase All), 3. Information.

Unfortunately I just checked the faq's on the blaupunkt website and it's an error in the manual. apparantly it is not actually possible to upload your own animations onto the player. sorry to dissapoint you.