View Single Post
Old 24th Aug 2010, 2:18 am   #16
amp_mangler
Retired Dormant Member
 
Join Date: Aug 2010
Location: Mareeba, Queensland, Australia.
Posts: 140
Default Re: Old car radio - how to change polarity?

Steve_P has it
I use T03 mounting bushes and neat L-brackets made from aluminium angle mount the radio to that and MAKE sure its isolated !!!!
ALSO Isolate the aerial from the car body ( should already be so if the car aerial is mounted correctly) then fit an isolating washer to the UNDERSIDE of the car aerial, where its mounted to the body, THEN connect direct to battery ( thats easy and DOESNT need Ford USA type 300 or so eye tags screwed to the battery posts directly.

NEGATIVE, or the previously " hot" lead goes to the body of the car
POSITIVE can go to the ACC(sesory) lead for the car
I have done many like that, and with a lil grinding and filing of the aluminium L-brackets you wont even notice

BUT beware !!!!!! IF the radio is mounted using the extra nuts on the volume pot and tuning shaft, that ALSO needs insulating, I use power diode bushes and fibre washers

Joe
amp_mangler is offline