notothisrealm Posted September 25, 2015 Share Posted September 25, 2015 So, I wired up this fuse block on my 71 240z V8 and am trying to figure out what size fuses to use for each wire. The one on the left is coming from the alternator. The one in the middle is going to the white w/red stripe wire that went to the old ammeter. And the one on the right is a blue wire going to the fuel pump relay. Quote Link to comment Share on other sites More sharing options...
beermanpete Posted September 25, 2015 Share Posted September 25, 2015 The first two fuses you mentioned are essentially in series and likely redundant. Size for these needs to be about 120% of the alternator's output rating. The fuel pump fuse depends on your pump. Does the pump manufacturer offer a recomendation for the fuse? Quote Link to comment Share on other sites More sharing options...
notothisrealm Posted September 25, 2015 Author Share Posted September 25, 2015 Ah! I didn't even think about looking up the fuel pump recommendations. It says to use a 7 1/2, its a holley blue. Sound right? Hmmmm, so the alternator doesn't need a fuse in between it and the battery? Quote Link to comment Share on other sites More sharing options...
beermanpete Posted September 25, 2015 Share Posted September 25, 2015 For the fuel pump, use what Holley recommends. The early Z does not have any fuse or fusible link on the alternator output. There is one fusible link between the battery and the whole car, including the alternator. You can add a fuse or fusible link if you want, it can't hurt. You should have a fusible link between the battery and the car as well. The fuse you have in the ammeter lead is not necessary, especially if you have the other two. Quote Link to comment Share on other sites More sharing options...
notothisrealm Posted September 26, 2015 Author Share Posted September 26, 2015 Thanks for the help, brother. Have a good one! Quote Link to comment Share on other sites More sharing options...
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