well i found a shop near me that carries ANL fuses and i tried out the Fuse box i had here with a 250 amp fuse and it worked last night and turned on the car. But for some reason today went to start it today and after the 2nd time cranking the car over the fuse popped. So what do you guys think might have cause this is maybe 250 not enough for everything in the car?
I thought I mentioned this in my earlier post but maybe not...I may have just thought it.
You cannot use an ANL fuse in this application.
As Vince mentioned (as well as myself) even though the starter may have constant draw of 150A, there are/could be very high spikes in the current. ANL fuses are not meant to handle any spikes at all.
You need a Mega fuse like I suggested because they are a "slow blow" fuse that resist the high current spikes.
I'm pretty sure most parts stores should carry those mega fuses although I'm not sure if they will carry 250A ones.
Well fuses also protect devices (like the ECU) from damage. Since all the devices in the car are protected and the battery is essentially always "on" I see no benefit of fusing it. A shut-off (disconnect) might be handy.
This is a good point too. With 1/0 wire I wouldn't see the need to fuse it from the battery. In my situation I was protecting the alternator wire from overcurrent. Instead of putting a fuseable link on my alt wire (they don't make an appropriate fuseable link for 1AWG) I had to use a slow blow fuse. Instead of making my cable more complicated (something in-ine) since the alt cable connects to the battery directly, I just fused that wire alone. They make a battery terminal post mount slow blow fuse that worked perfect for my application.
OP, are you running the 1/0 to your starter too?