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1996 Miata Excalibur Fuse Blowing


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craighead 
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Location: California, United States
Posted: March 04, 2015 at 2:49 AM / IP Logged Link to Post Post Reply Quote craighead
Hi everyone!
I'm installing an Excalibur 1860 in my Miata and I have an issue.
I converted a negative output(Channel 3) to positive through a relay in order to trigger my pop-up headlights(raising and lowering, not illuminated). It works fine.....once, then the 10a fuse in my fuse box blows.
Is this a problem with tapping into a 12v constant source that doesn't have a high enough amp fuse? Is it a problem with my relay not having a diode? If it's the lack of diode, which pins and direction should the diode be between?
My relay is set as follows:
pin 85: (-) trigger from alarm
pin 86: (+) 12v constant
pin 30: (+) 12v constant
pin 87: (+) pop-up headlight output
Thanks for your time and help!
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
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Location: United Kingdom
Posted: March 04, 2015 at 5:26 AM / IP Logged Link to Post Post Reply Quote howie ll
You will need a 5 pin relay, wire thus:-
Cut the headlight motor wire you joined to.
87a to car side.
30 to headlight side.
87 and 86 joined and connected to battery via a 15 or 20 amp fuse.
85 from alarm input.
Diode, 1N4004 across 85 and 86, band to 86 to protect your alarm.
The reason , that headlight motor wire is sitting on ground at rest, you need to separate the motor up wire from its ground source.
This is exactly how a window motor, door lock, or trunk release is done.
craighead 
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Joined: March 03, 2015
Location: California, United States
Posted: March 04, 2015 at 12:30 PM / IP Logged Link to Post Post Reply Quote craighead
Thank you very much for your thorough reply!
Question: So the constant 12v needs to be a direct shot to the battery? No taping into existing 12v constant lines under the dash? Miata has the battery in the trunk so it makes it a little more challenging.
tedmond 
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Joined: January 06, 2007
Location: Ontario, Canada
Posted: March 04, 2015 at 2:04 PM / IP Logged Link to Post Post Reply Quote tedmond
look at the fuse box, there should be one large gauge wire thats constant 12v.
Ted
2nd Year Tier 1 Medical School
Still installing as a hobby...pays for groceries
Compustar Expert
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: March 04, 2015 at 2:32 PM / IP Logged Link to Post Post Reply Quote howie ll
X 2 with Ted.
craighead 
Member - Posts: 12
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Joined: March 03, 2015
Location: California, United States
Posted: March 04, 2015 at 3:40 PM / IP Logged Link to Post Post Reply Quote craighead
Thanks.
Is it OK to tap into any other 12v constant under the dash or is it preferable to get it from before the fuse box? It's extremely tight near the fuse box.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
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Posted: March 04, 2015 at 3:52 PM / IP Logged Link to Post Post Reply Quote howie ll
The thicker the wire the better, also spreads the load. Isn't there an engine bay fusebox with a constant feed?
craighead 
Member - Posts: 12
Member spacespace
Joined: March 03, 2015
Location: California, United States
Posted: March 06, 2015 at 5:08 AM / IP Logged Link to Post Post Reply Quote craighead
Hi again!
I have a couple more questions that I could use some help with...
1. My Miata has a door trigger wire(-) and a trunk trigger wire (-). Can these be combined and connected to the Door Trigger(-) input of my alarm?
2. My alarm has the following to trigger the dome/supervision light:
Light Relay N/O (+/-) Input BLACK/ Red
Light Relay N/C (+/-) Input WHITE/ Red
Light Relay COM Output GREEN/ Violet
My Miata has a RED / white wire for Dome Light supervision.
How should that be connected?
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: March 06, 2015 at 6:04 AM / IP Logged Link to Post Post Reply Quote howie ll
1) Yes but diode separate, 1N4004, bands towards switches.
2) Not sure, BLACK/ red to ground, GREEN/ violet to door trigger AFTER above diode connection.
craighead 
Member - Posts: 12
Member spacespace
Joined: March 03, 2015
Location: California, United States
Posted: March 07, 2015 at 2:42 PM / IP Logged Link to Post Post Reply Quote craighead
Question:
My alarm has a "4 Pin Door Lock Port". One of the wires is a constant 12v output. Can I just tap into this to power my headlight relay?
Thanks!
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