Discussion
Hi Mike.
The Corsa only has 2 pr of wires from the key switch and they are .5mm so only about 3 amps, both ign on and start has to go through relays, the starter only needs a supply of 10 amps so a normal 30a relay will be ok but the fuse box feeds will require quite a large relay just not sure if 100a will he enough or should I go for a Solid State type relay.
Alan
The Corsa only has 2 pr of wires from the key switch and they are .5mm so only about 3 amps, both ign on and start has to go through relays, the starter only needs a supply of 10 amps so a normal 30a relay will be ok but the fuse box feeds will require quite a large relay just not sure if 100a will he enough or should I go for a Solid State type relay.
Alan
Alan Whitaker said:
the starter only needs a supply of 10 amps
Starter solenoids often use a 'peak and hold' design where they draw a high current (around 30A is common) until they close, and closing the contact drops the current to an 8 - 10A holding current. If your solenoid is similar, that 30A relay will be distinctly marginal and could degrade over time. For something critical like this, I think it would be worth significantly over-rating the relay.Using a relay of such a high rating will very likely be overkill due to most heavy consumption ignition circuits having their own switchable ignition controlled relays
It is not good practice to relay the ignition coil supplies and they are best taken directly from the ignition switch
When taking into consideration what ignition circuits are not likely to have their own relays, I get a list something like -
1) Wipers
2) Blower Motor for interior heating/cooling
3) Indicators
4) Brake Lights
5) Reverse Lights
Then I would be wiring in -
1) Wiper circuit supply relay
2) Blower Motor supply relay
3) Indicators/Brake Lights/Reverse Lights supply relay (1 relay for the 3 circuits)
Now I would be left with the ignition switch doing very little work apart from supplying the ignition coils
It is not good practice to relay the ignition coil supplies and they are best taken directly from the ignition switch
When taking into consideration what ignition circuits are not likely to have their own relays, I get a list something like -
1) Wipers
2) Blower Motor for interior heating/cooling
3) Indicators
4) Brake Lights
5) Reverse Lights
Then I would be wiring in -
1) Wiper circuit supply relay
2) Blower Motor supply relay
3) Indicators/Brake Lights/Reverse Lights supply relay (1 relay for the 3 circuits)
Now I would be left with the ignition switch doing very little work apart from supplying the ignition coils
Reference Corsa b Ignition switch wiring
fat black
black medium
black thin
black red strip
fat red
thin red
Taken from http://www.turbosport.co.uk/showthread.php?t=45572...
fat black
black medium
black thin
black red strip
fat red
thin red
Taken from http://www.turbosport.co.uk/showthread.php?t=45572...
I am like you have probably already done, wondering if the heavier ignition switch will fit or if an earlier switch with steering lock could be used
If you have no options but to use that small switch, as long as you are relaying everything similar to what I have posted above, you could use a standard 40 Amp relay for ignition coils supply and another for crank
If you have no options but to use that small switch, as long as you are relaying everything similar to what I have posted above, you could use a standard 40 Amp relay for ignition coils supply and another for crank
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