Custom Electrical - Heavy Duty Relay Question

[Doug1]

Originally Posted by CJD Automotive

I would use a two pole master cutoff switch. It would simplify and clean up some of the wiring. One pole removes the battery from the system, and the other is usually connected through the coil power...no coils, engine shuts off, no alternator output.

I already have the stuff so I'm going to try to make it work. The thing I'm after is this...

1. How do I get power to 2 power distribution blocks so they are supplied power only when the switch is on. I already have power distribution blocks that always have power but want to add 2 that have power only when switched. I'd like each leg to support approximately 100 amps continuous use

[blitzer454]

I just read the documentation from painless. The relay that goes along with the cutoff switch is there to provide a load for the alternator when the cutoff switch is in the off position. This will prevent the damage that GregWeld was warning you about.

One thing that I would change in your circuit would be to connect a heavy gauge wire directly from the cutoff switch to the remote starter solenoid instead of going from the cutoff switch to the bus bar and then to the remote starter solenoid. You don't want to run the starter current through the bus bar as the bus bar may not be able to handle that current and it will present an additional resistive load that will steal power from the starter.

As far as adding switched bus bars, I can't think of any other way except to add high current relays downstream of the bus bars that you currently have. The relays would use the positive voltage from the ignition switch when in the key is in the run/start positions.

[CJD Automotive]

Originally Posted by Doug1

I already have the stuff so I'm going to try to make it work. The thing I'm after is this...

1. How do I get power to 2 power distribution blocks so they are supplied power only when the switch is on. I already have power distribution blocks that always have power but want to add 2 that have power only when switched. I'd like each leg to support approximately 100 amps continuous use

Something like this? https://www.waytekwire.com/item/7551...MOTE-HD-RELAY/

[Doug1]

Originally Posted by CJD Automotive

Something like this? https://www.waytekwire.com/item/7551...MOTE-HD-RELAY/

That does look sweet. Though I'm not familiar with phrase
"Bi-stable" for circuitry. I'll need to Google that 😏

[MtotheIKEo]

Look into Tyco Kilovac relays. Up to 500 amp continuous rated, operated with very little current from a switch. You can join the positive trigger wire with the high amperage cable terminal, and just switch the ground to make it real easy to install.

http://www.te.com/commerce/DocumentD...ocLang=English