986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Electical Question re: Pin 18 on Cab Relay

jim_hoyland · 04-01-2010, 08:26 AM

I just wired my Becker radio so the variable volume function would work. A wire was run from pin #1 at the radio to pin #18 of the dual relay for the cabriolet top. The mod has been well documented and I now have automatic increases in volume as the car goes faster.

My question is kinda techical: What is the signal pin #18 emits ? I want to install a CDR in my 914 and would like to figure a way to duplicate the signal. The first thought was to consider the Tach signal. Any eletrical geru's out there ?

Thanks,

Jim

04-01-2010, 08:26 AM	#1
jim_hoyland Registered User Join Date: Nov 2006 Location: Sunset Beach, CA Posts: 305	Electical Question re: Pin 18 on Cab Relay I just wired my Becker radio so the variable volume function would work. A wire was run from pin #1 at the radio to pin #18 of the dual relay for the cabriolet top. The mod has been well documented and I now have automatic increases in volume as the car goes faster. My question is kinda techical: What is the signal pin #18 emits ? I want to install a CDR in my 914 and would like to figure a way to duplicate the signal. The first thought was to consider the Tach signal. Any eletrical geru's out there ? Thanks, Jim