It's unlikely one of those probe type meters will have a 10A range and maybe something like 200mA at best if at all.

Got a better photo Tony?

Put a resistor in series with the meter? No, that won't work.

As Michael says break either the positive or negative lead (negative would be a bit better in a negative earth car). Put the meter on its highest range (a suitable meter will have a 10A range) and work down from there. Make sure you use the current terminals since they are probably different. Bridge the break with the meter so the current flows through the meter. Also as mentioned, it doesn't really matter with polarity. If wrong the meter will just read "negative" current.