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#1069893 - 03/14/21 11:53 PM Switched power for multiple relays?  
Joined: Dec 2003
Posts: 1,574
spacemanspif Offline
15+ Year
spacemanspif  Offline
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Joined: Dec 2003
Posts: 1,574
Sewell, NJ
Hi all,

Been away a while with a new baby but have the car down for an engine upgrade and want to address some short cuts I took over the years.

What is your preferred method of distributing switched power to multiple items the cabin or engine bay?

I have relays for fans under the hood and want to add another for a wide band O2 sensor soon. Maybe nitrous down the road. My fan relays are currently piggy-backed on the choke circuit. I know relays don’t draw much but don’t want to add more to that circuit. I’ve looked at bus bars and power posts online but don’t know if there is something better out there. Or should I just run a wire loop around the engine and pull lines off wherever I have a relay close by?

I’m looking for simple, safe, and expandable. Might be asking for too much but better to ask than never try, right?


-Mike

F-body bucket seats, camaro console, carb'd 5.3/4L80E swap

Fastest time to date: 13.390 @ 102.42
Best r/t: 0.007 I got lucky smile

Killed a few cones too

#1069904 - 03/15/21 02:25 PM Re: Switched power for multiple relays? [Re: spacemanspif]  
Joined: Apr 2011
Posts: 1,126
Hunter79764 Offline
Member
Hunter79764  Offline
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Joined: Apr 2011
Posts: 1,126
Grand Prairie, Tx
I used something like this that I was able to grab from the trash bin at work. It looked a little different, and had 1/4" spade terminals on it and 3 different sections (I used one for 12V constant, one for 12V ignition, and one for ground). Fed it off of a relay for the ignition source so that I've got one relay powering the block, and then multiple relays feeding each device. If that relay dies, I don't have computer, fuel pump, fans, or a few other items so I keep a spare on hand at all times, but it will also be easy to troubleshoot. And if you are going for clean, you can mount this at a good location (close to battery?) and keep wire runs short to the high amp stuff. Stuff like a wideband could pull straight off the block since you have ~30 amps to play with. I like the ground block too, not only because it keeps it simple but because if you have weird issues, it will likely affect multiple things and any one of them will trace back to that location.

https://www.amazon.com/Recoil-Studs-Screw-Terminals-Distribution/dp/B08C9MXVFQ/ref=sr_1_11_sspa?dchild=1&keywords=Distribution+Connecting+Blocks+1%2F4%22&qid=1615817820&s=audio-video-accessories&sr=1-11-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExU1ExVDZOTUlKUjY1JmVuY3J5cHRlZElkPUEwNTcxNDk0Q0o3VUxOVFdQWDVLJmVuY3J5cHRlZEFkSWQ9QTAxODE4OTMzT1NVVDJPWkdHQ0daJndpZGdldE5hbWU9c3BfbXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==


Shawn

'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end
It ain't much off the line, but it's nice on the highway
#1069905 - 03/15/21 02:52 PM Re: Switched power for multiple relays? [Re: spacemanspif]  
Joined: Dec 2007
Posts: 6,400
SSLance Offline
10+ Year
SSLance  Offline
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Joined: Dec 2007
Posts: 6,400
Peoria, AZ
Here is the post where I showed the relay box I installed during my EFI upgrade.

http://www.montecarloss.com/community/ubbthreads.php?ubb=showflat&Number=1062092#Post1062092

I think the box was like $19 on Amazon and came with all weather pack connectors and a cover. I pulled the constant hot straight from a battery post to a distribution block, same with ground block, and the switched power from the purple wire to the distributor that turns on all the key on relays.


Lance
1985 Monte Carlo SS Street Car
#1069906 - 03/15/21 02:57 PM Re: Switched power for multiple relays? [Re: spacemanspif]  
Joined: Dec 2007
Posts: 6,400
SSLance Offline
10+ Year
SSLance  Offline
10+ Year
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Joined: Dec 2007
Posts: 6,400
Peoria, AZ


Lance
1985 Monte Carlo SS Street Car
#1069907 - 03/15/21 02:59 PM Re: Switched power for multiple relays? [Re: spacemanspif]  
Joined: Dec 2007
Posts: 6,400
SSLance Offline
10+ Year
SSLance  Offline
10+ Year
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Joined: Dec 2007
Posts: 6,400
Peoria, AZ


Lance
1985 Monte Carlo SS Street Car
#1069911 - 03/15/21 05:12 PM Re: Switched power for multiple relays? [Re: spacemanspif]  
Joined: Apr 2011
Posts: 1,126
Hunter79764 Offline
Member
Hunter79764  Offline
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Joined: Apr 2011
Posts: 1,126
Grand Prairie, Tx
Saw your link to the part, thought I'd repost here for reference. That is a nice looking setup for multiple relays, looks factory.
https://www.amazon.com/gp/product/B07MR64XK1/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1


Shawn

'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end
It ain't much off the line, but it's nice on the highway
#1069917 - 03/15/21 09:55 PM Re: Switched power for multiple relays? [Re: spacemanspif]  
Joined: Dec 2003
Posts: 1,574
spacemanspif Offline
15+ Year
spacemanspif  Offline
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Joined: Dec 2003
Posts: 1,574
Sewell, NJ
Ok I like your style guys and am reading you loud and clear that I should clean and consolidate. But still my question remains. What do you use to power all these relays? My fans are ground controlled and I’d want my wide band on with the ignition, so do I just leaf-frog my switched power wire from 1 relay to the next?


-Mike

F-body bucket seats, camaro console, carb'd 5.3/4L80E swap

Fastest time to date: 13.390 @ 102.42
Best r/t: 0.007 I got lucky smile

Killed a few cones too

#1069918 - 03/15/21 10:11 PM Re: Switched power for multiple relays? [Re: spacemanspif]  
Joined: Apr 2011
Posts: 1,126
Hunter79764 Offline
Member
Hunter79764  Offline
Member

Joined: Apr 2011
Posts: 1,126
Grand Prairie, Tx
I found one ignition source (can't remember what it was from, might have pulled it from the column or the original ECM feed, maybe just an IGN labeled fuse in the box? 10 year old memory is getting fuzzy...), ran it to a single 30A relay that got it's feed from the battery and is switched on with ignition.
That relay gave me 30 amps available power at the terminal block where all my ignition-powered relays and minor draws fed from, making it easy to add relays or accessories without having to tap into that one little wire over an over.

How I did it was physically ugly, but it worked out well from a system operation standpoint vs trying to find ignition sources and piggy-backing off of random other wires that would make it hard to troubleshoot later. I know you have mentioned trying to keep wire clutter out of the bay, only reason I mentioned clean, absolutely no judgement from me on clean wiring!


Shawn

'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end
It ain't much off the line, but it's nice on the highway
#1069919 - 03/15/21 10:18 PM Re: Switched power for multiple relays? [Re: spacemanspif]  
Joined: Apr 2011
Posts: 1,126
Hunter79764 Offline
Member
Hunter79764  Offline
Member

Joined: Apr 2011
Posts: 1,126
Grand Prairie, Tx
Speaking of ugly, how about a text-drawing to confuse things?

`****Ign wire ******* Battery +12 **************
`************ \ ******* / ***************************
`************ 85 *** 87 ***************************
`************ RELAY ***************************
`*********** 86 **** 30 ***************************
`*********** / ********* \ **************************
`Ground** / ********** \ ***************************
` ********************* Distribution block ********
` ******************** / *** | ******** | ****** \ *****
`**************** Acc#1 Acc#2 Acc#3 Acc#4

Last edited by Hunter79764; 03/15/21 10:23 PM.

Shawn

'85 MC with budget 5.3L swap, TH350 with stock 2.14 rear end
It ain't much off the line, but it's nice on the highway
#1069920 - 03/15/21 10:41 PM Re: Switched power for multiple relays? [Re: spacemanspif]  
Joined: Dec 2007
Posts: 6,400
SSLance Offline
10+ Year
SSLance  Offline
10+ Year
Member

Joined: Dec 2007
Posts: 6,400
Peoria, AZ
I used the Pink wire going to the distributor, extended it to the front area by my relay box and split it up to each of the relays I wanted to come on with the key. I didn't need it for my distributor any longer but if you still do, just splice into it by distributor and extend it to your relay box.


Lance
1985 Monte Carlo SS Street Car
#1069925 - 03/16/21 03:01 AM Re: Switched power for multiple relays? [Re: spacemanspif]  
Joined: Dec 2003
Posts: 1,574
spacemanspif Offline
15+ Year
spacemanspif  Offline
15+ Year
Member

Joined: Dec 2003
Posts: 1,574
Sewell, NJ
I appreciate the help guys. I gotta check my wiring for unused wires that have switched power. My distributor pink powers my MSD box and choke still runs to the carb’s choke. I deleted A/C so maybe the fan wire or something else will give me my leg to leap frog to all the relays.

Thanks again for the links and ideas.


-Mike

F-body bucket seats, camaro console, carb'd 5.3/4L80E swap

Fastest time to date: 13.390 @ 102.42
Best r/t: 0.007 I got lucky smile

Killed a few cones too

#1070109 - 03/28/21 10:11 PM Re: Switched power for multiple relays? [Re: spacemanspif]  
Joined: Aug 2010
Posts: 277
tom demarco Offline
Member
tom demarco  Offline
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Joined: Aug 2010
Posts: 277
Burlington
auto rod controls has what you need


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