Wiring advice

[PhilKC]

Right, does this seem like a sane way to connect two nautiluses (nautili?) and other electric bits. (Minimum fuse for Maxi is 20A, hence second fuse straight after)

=== 4AWG
||| 8AWG
*** 12AWG
... Some silly high AWG that needs ~ a 2A fuse.
+++ Stock wiring
SH Stock Horn
H1 Nautilus 1
H2 Nautilus 2
TTR TomTom Rider
7809 9V regulator with a couple of caps (12->9V)


+12V ===[60A Fuse]===[4 out Maxi fused distribution block]
[40A] [20A] [20A] [20A]
| * * *
| [-12V] * * *
| + * * *
[30] + [2A] [2A]
+12V ++++++++++++ [86] Relay [85] . .
* [87] * . .
* / \ * . .
[+ SH]********** / \ ** [TTR] [7809]
/ \ . ...[+9V]
[+ H1] [+ H2] . ...[-9v]
[- H1] [- H2] . .
\ / [-12V] [-12V]
\ /
\ /
[-12V]
The stock horn doesn't connect to the two wires coming from the 87 pin.

Problems I can see so far:

It's in ASCII, what a waste of half an hour.
2 airhorns -> 36A, needs 8AWG which means the normal crimp connections are out, ideas?
Maplins don't seem to have any 50A relays (I assume that using a 40A fuse with a 40A relay is unlikely to save the poor relay from a painful death)
Or any cheap 4/8AWG cable (Seems to be classed as audio cable)
How angry is the battery going to get if I start pulling 40A+ from it?

Thoughts?

[the_lone_wolf]

How angry is the battery going to get if I start pulling 40A+ from it?

Thoughts?

the starter motor basically shorts the battery out and that only draws ~80A iirc

tbh one is plenty loud enough, but if i were fitting two and was concerned about components melting i'd wire them in parallel right from the battery, two fuses, two relays etc - but use the same 12V signal to flip both relays

[yorkie_chris]

Battery will be fine so long as you don't sound the horn for minutes at a time.