MSD Solid State Relay Box Opinions

wesinls

wesinls

Well-known member
May 6, 2021
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Anyone using them?  One obvious disadvantage is if a portion of it fails the whole box needs to be replaced - but is that likely?  Sure simplifies wiring.

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Several guys in our group are running Leash relay boxes. The Leash is pretty versatile and I like the set-up. Can't comment on the MSD stuff cause I have no experience with them.

 
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I use SSRs for work.  While not specifically this model, we very rarely have them fail.  

Great thing is you can use it with a PWM controller for your existing brushed fans to cut down on cycling/current draw and maintain a more even temperature.  

 
I have used them on a few cars, and as @Rockwood said they are great for controlled  PWM  devices (I use these with the Holley ECU), but what I like is that if one does fail as long as you put a service loop (and battery cutoff switch)  in the wiring you can jump the SSR if needed

 
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Fullthrottleguy said:
I have used them on a few cars, and as @Rockwood said they are great for controlled  PWM  devices (I use these with the Holley ECU), but what I like is that if one does fail as long as you put a service loop (and battery cutoff switch)  in the wiring you can jump the SSR if needed
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I wonder if you can use it with the Holley or other engine management to cut out a fuel pressure regulator as well...? Ford's been doing this for years with their returnless fuel pump setups: no fuel pressure regulator, just use the fuel pressure sensor to control fuel pump output in real time.  Especially useful if you have a monster pump and are just pumping it through the regulator constantly heating it.

 
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Mike E said:
Several guys in our group are running Leash relay boxes. The Leash is pretty versatile and I like the set-up. Can't comment on the MSD stuff cause I have no experience with them.
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I use the Leash relays and boxes on some cars because they have 70amp SEALED relays and have a fuse, super convenient for an add-on situation.. also their fuse boxes are self contained with 70 amp relays  and fuses ands have a LED that indicates a bad fuse 

The downsize is a failed relay can only be replaced by Leash  (or you can desolder yourself of course)

 
Fullthrottleguy said:
I use the Leash relays and boxes on some cars because they have 70amp SEALED relays and have a fuse, super convenient for an add-on situation.. also their fuse boxes are self contained with 70 amp relays  and fuses ands have a LED that indicates a bad fuse 

The downsize is a failed relay can only be replaced by Leash  (or you can desolder yourself of course)
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BUT, the whole thing is only like $25.

 
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