HELP: electric/fuse - for V8 radiators |
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HELP: electric/fuse - for V8 radiators |
jimkelly |
Aug 30 2015, 04:22 PM
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#1
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
I test ran my engine after running a bunch of wiring and fuse blocks for my horn, wipers, and radiators.
the blocks are rated for 6 fuses, all can be 20 amp circuits. I had one 20 amp fuse (in my dash fuse block) feeding my front trunk fuse block, which had two 15 amp fuse for each radiator, and a 10 amp fuse for my horn. when the engine got to temp, the 20 amp fuse in my cabin blew. I can only keep it from blowing if I run only one radiator by leaving one 15 amp fuse out of my front trunk fuse block. looks like I have no choice but to run another (10 guage 12v) hot from battery to radiator area, to a fuse block that can handle at least two 30 amp fuses, one for each fan. thanks guys! Attached thumbnail(s) Attached image(s) |
Mike Bellis |
Aug 30 2015, 05:31 PM
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#2
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
I have fuse panels in the front trunk, rear trunk and under the dash. I agree you need at least a 10ga wire from the battery. You will need to fuse this wire within 18" of the battery as well.
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andys |
Aug 30 2015, 05:49 PM
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#3
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Advanced Member Group: Members Posts: 2,165 Joined: 21-May 03 From: Valencia, CA Member No.: 721 Region Association: None |
Yeah, you need to run a dedicated power wire for your fuse block. I ran an 8ga wire to mine, which powers two radiator fans (20A each), fuel pump (20A), and OBD II power (10A). The 8ga wire runs through a 50A circuit breaker.
Andys |
jimkelly |
Aug 30 2015, 06:41 PM
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#4
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
so I guess I will use the one remaining bussmann fuse block I have to power my radiators. it has six 20 amp circuits. I will use two to power my two radiators with a 20 amp fuse to each.
what fuse do I put within 18" of battery? 50 amp? |
Spoke |
Aug 30 2015, 07:48 PM
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#5
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Jerry Group: Members Posts: 6,991 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
what fuse do I put within 18" of battery? 50 amp? Correct. This one is to prevent your main cable from the battery from being a fuse itself. In all the wiring you're doing, have you drawn up a schematic? I'm having trouble following your description of the wiring. |
Chris914n6 |
Aug 30 2015, 07:55 PM
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#6
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Jackstands are my life. Group: Members Posts: 3,333 Joined: 14-March 03 From: Las Vegas, NV Member No.: 431 Region Association: Southwest Region |
Fans are rated constant. There is a surge on startup that you will need to account for with the fuse rating. I'd say double constant, or whatever the factory used. Mine are 30 each, I'd have to look in the brochure what constant was for the Spal 11" HP.
Porsche didn't use any fuses at the battery, but new cars do, so it's up to you if you feel the need. |
jimkelly |
Aug 31 2015, 04:52 AM
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#7
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
here is all I can come up with at the moment.
I ran a 10 guage wire to my first fuse box but then ran it to subsequent boxes from a 10 amp fused spade from previous block ... BUT I think I should have ran my 10 guage wire to fuse block studs only, not thru fuses at each block. I will add a 50 amp fuse near battery. Attached thumbnail(s) |
jimkelly |
Aug 31 2015, 05:56 AM
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#8
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
new wiring - will put a 50 (or 100) amp inline fuse near battery today.
I currently have.. a 10 amp fuse to horn switch - will put a 5 amp fuse a 10 amp fuse to wiper switch - will put a 5 amp fuse a 10 amp fuse to horn relay a 10 amp fuse to horn relay a 20 amp fuse to radiator relay pass side a 20 amp fuse to radiator relay drivers side it seems 10 guage wire can handle up to 100 amps in a 10' run, which is about what I have. (a 10' run, not 100 amps of auxillary stuff) for the moment, I installed a 100 amp circuit breaker between battery and circuit. I also put switches on a panel for easier access to them. just ran it, got to 190 degrees, fans (2) came on and brought temp back down to about 165 or so. tested wipers while fans ran, all good, so far. time to hit the road. need to get registered and inspection, though I still think I have crap in my gas tank, after numerous replaced filters and partial gas drains, and fuel pump flushes. current fuel tank far better than removed tank BUT not perfect. Attached thumbnail(s) Attached image(s) |
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