Wiring- relays and fuses - Vintage Mustang Forums
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post #1 of 6 (permalink) Old 06-30-2019, 01:07 PM Thread Starter
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Wiring- relays and fuses

Just looking for feedback here.

I have a 8 new autometer gauges I am just about finished with.
I bought a new fuse block that has separate power input which will allow me to run the lights and main powers separate.
My plan is to use two relays to power both sides. The gauge lights being activated by the light switch, and the main power for gauges being activated by the ignition switch.

I was looking online at you tube videos and a lot of people run the fuses BEFORE the relays.

I was planning on doing just the opposite. Two relays, one for the 7 led lights, and one for all the main hots.
The main main load lines powering the two blocks.

Is there any issues doing it this way?







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post #2 of 6 (permalink) Old 06-30-2019, 01:26 PM
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No need to use a relay to power instrument lights as they don't draw many amps. LEDs pull hardly any amps at all.
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post #3 of 6 (permalink) Old 06-30-2019, 01:57 PM Thread Starter
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Wiring- relays and fuses

Well part of it is that I will be hooking some other stuff to the blocks... like transbrake shifter button, clean ignition, msd box etc.

That why I was thinking using the two relays to trigger the two banks of 6.



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Last edited by mikeyhunts; 06-30-2019 at 02:00 PM.
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post #4 of 6 (permalink) Old 06-30-2019, 03:52 PM
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It does not really matter which side of the relay the fuses are on. I personally use them on the power source side so that more of the wiring is protected. I like putting fuses as close to the source of power as possible. I adapted an entire 1986 Mustang harness for use in my car. Just like the factory (for 1986), I used a fusible link at that power source for the main supply to the fuse block.
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post #5 of 6 (permalink) Old 06-30-2019, 03:54 PM Thread Starter
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Quote:
Originally Posted by Greg'66 5.0 View Post
It does not really matter which side of the relay the fuses are on. I personally use them on the power source side so that more of the wiring is protected. I like putting fuses as close to the source of power as possible. I adapted an entire 1986 Mustang harness for use in my car. Just like the factory (for 1986), I used a fusible link at that power source for the main supply to the fuse block.


Thank you.
Thatís the feedback I was looking for.
Just wanted to make sure I was thinking about it correctly.



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post #6 of 6 (permalink) Old 07-05-2019, 03:30 PM
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Mike,

I sent you a response to your PM, but here it is for others:
https://www.waytekwire.com/item/7564...-12C-DN-X-80A/

Waytek is my "go to" vendor and they have various relay options that have built in diodes for flyback current protection.

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