Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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bestdog
Romney Palma

(11 posts)

Registered:
11/08/2011 01:48PM

Main British Car:
Neutral safety switch and fuse rating
Posted by: bestdog
Date: September 09, 2012 07:34PM

Hellow all.
I have started my rover fuel injection conversion, 2 issues have pop-up. 1st-, how to deal with the neutral safety switch, the ECU only wants 5 volt input , if i just ground the wire i will be sending 12 volts to the ECU i worry i would fry the ECU. 2nd .- fuel pump requires a fuse, i do not have the wiring diagram for the whole R.R. so i do not know the rating. My set up is MGB with 3.9 Lt Rover engine and stock Rover fuel injection, Rover 5 speed trans.
I know many of you have gone down this road before me, and aquired the knowlege. Would you guys mind sharing this info with a novice?.
Thank you all.
Romney.


lars49
Larry Barnes
Colorado Springs
(177 posts)

Registered:
06/11/2009 02:12PM

Main British Car:
1980 MGB GM LA1 3400 V6

authors avatar
Re: Neutral safety switch and fuse rating
Posted by: lars49
Date: September 12, 2012 01:09PM

Romney,

The fuse is there to protect the wire not the pump. Typically fuses are rated at 80% of the current capacity of the wire. For the safety switch you need a voltage divider. Is the switch connecting to ground and 12 volts? I don't understand your circuit if you are grounding the switch how are you getting 12 volts to the ECU?


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