Steve Posted March 30, 2008 Share Posted March 30, 2008 I am trying o find a cable in the dash, to trigger a relay that will start to charge a second battery in the boot. But i only want it to switch over once the engine is started, so am looking for a feed that becomes live once the engine is started not when the ignition is turned on to the first/second position. The obvious choice would be the back of the alternator i presume, but there must be a wire in the dash somewhere that does the same? Maybe by the ECU? Also where can i power 3 new gauges from? They only pull around 50ma each when lit up. Was thinking of coming off the back of the ignition barrel and fitting a seperate inline fuse. Thanks in advance. Link to comment Share on other sites More sharing options...
bignum Posted March 30, 2008 Share Posted March 30, 2008 Ive powered my gauges from the back of the ciggy lighter as for the switched engine live couldnt you bring it off the fuel pump relay? Link to comment Share on other sites More sharing options...
Steve Posted March 30, 2008 Author Share Posted March 30, 2008 Ive powered my gauges from the back of the ciggy lighter as for the switched engine live couldnt you bring it off the fuel pump relay? Will look at that Any other locations for the switched live? Link to comment Share on other sites More sharing options...
Ryan.G Posted March 31, 2008 Share Posted March 31, 2008 If its just to activate a relay then you could use the FPC output if you are using a powerfc as it sends out a 12v signal to the fuel pump ecu when an RPM is achieved. Please note though this is not the 12v feed which the fuel pump use. It is just an activation signal to switch over the pole in the Fuel pump ecu. B+ is the supplied 12v feed for the FP. But if you dont get the Powerfc Steve then a HS drive can be activated from the Link ecu when it see's an rpm signal. Ryan Link to comment Share on other sites More sharing options...
merckx Posted March 31, 2008 Share Posted March 31, 2008 Also where can i power 3 new gauges from? They only pull around 50ma each when lit up. Was thinking of coming off the back of the ignition barrel and fitting a seperate inline fuse. The radio is a good one but take the power after the fuse which protects the radio. Link to comment Share on other sites More sharing options...
Steve Posted March 31, 2008 Author Share Posted March 31, 2008 If its just to activate a relay then you could use the FPC output if you are using a powerfc as it sends out a 12v signal to the fuel pump ecu when an RPM is achieved. Please note though this is not the 12v feed which the fuel pump use. It is just an activation signal to switch over the pole in the Fuel pump ecu. B+ is the supplied 12v feed for the FP. But if you dont get the Powerfc Steve then a HS drive can be activated from the Link ecu when it see's an rpm signal. Ryan Thanks Ryan, will let you know which way i end up going Link to comment Share on other sites More sharing options...
Steve Posted March 31, 2008 Author Share Posted March 31, 2008 The radio is a good one but take the power after the fuse which protects the radio. Thanks for the advice mate Link to comment Share on other sites More sharing options...
Steve Posted April 6, 2008 Author Share Posted April 6, 2008 As my car is in pieces at the minute i cant check this myself. Does the cig lighter become live on the first click on the ignition or the second when all the dash lights come on? Link to comment Share on other sites More sharing options...
Recommended Posts
Please sign in to comment
You will be able to leave a comment after signing in
Sign In Now