Power for handsfree kit

Hi, I installed phone handsfree kit but  it makes cracking noise in it's speaker. I draw power from fuse box. Ground in fuse box as well. Should I go directly to battery? - I have heard that alternator make a lot of noise and if you go to battery direct it will work better. I would apreciate any input. Thanks

Ground to the chassis where there is no paint on the metal. Try this and post your results.

what vehicle are you fitting too? and what sort of phone kit?

Plus, are you trying to run the phones speaker into a factory audio system (as on some Audi's and european style stereos).

We had a problem in NZ where Ford radio's accepted the speaker output of phone kits into the factory stereo. Great until you started the car up and encounted whine and ticking. It was fixed by re-earthing as Jeff has suggested and adding an in-line noise filter on the phone kits power lead.

If Jeffs suggestion hasn't fixed your problem, try adding a noise filter.

Cheers,

Glynn

I forgot - handsfree kit is Ericsson HCA-20 with T-68i phone. My ML-500 has navigation MCS and Bose amp (what a pain in the A..).

a good reason why not to use those T-tap's.