Mudmonkey Posted March 25, 2015 Share Posted March 25, 2015 Does anyone know off the top of their head the max amps that go through the 4mm cable between the ignition switch and starter relay? Many Thanks Quote Link to comment Share on other sites More sharing options...
Ed Poore Posted March 25, 2015 Share Posted March 25, 2015 Do you want to know what it can carry or what it normally carries? Quote Link to comment Share on other sites More sharing options...
Mudmonkey Posted March 25, 2015 Author Share Posted March 25, 2015 What it would normally carry. I've noticed the cable on the other side of the starter relay to the ECU is only 1mm so it can't be carrying too much. Quote Link to comment Share on other sites More sharing options...
pat_pending Posted March 25, 2015 Share Posted March 25, 2015 It only takes a few amps to operate the relay, it's the relay contacts that take the larger current, 10-15 amp to energise the starter solenoid. Quote Link to comment Share on other sites More sharing options...
Mudmonkey Posted March 25, 2015 Author Share Posted March 25, 2015 Thought as much, just seems odd that its such thick cable to the coil side of the relay? Quote Link to comment Share on other sites More sharing options...
Ed Poore Posted March 26, 2015 Share Posted March 26, 2015 When the relay connects and disconnects it's back EMF can generate considerably larger currents than it would carry in normal operation. Hence why there tends to be a bit of an overrating on most cabling. Quote Link to comment Share on other sites More sharing options...
HoSS Posted March 28, 2015 Share Posted March 28, 2015 When the relay connects and disconnects it's back EMF can generate considerably larger currents than it would carry in normal operation. Hence why there tends to be a bit of an overrating on most cabling. rubbish. The back emf is a voltage that lasts for a very short time, no extra current. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.