The master switch or battery isolation switch on a t409 is located on the left hand side of the chassis behind the cabin. By installing this you gain control over thieves who want to drive off your vehicle.

Battery Master Disconnect Switch Freightliner Peterbilt Ebay
Kenworth battery disconnect switch. Battery disconnect switches give you the ability to cut power to your ride before storing your hot rod battery during routine maintenance or after an on track accident. Jegs master battery disconnect switch 300 amps continuous 2000 amps momentary. A great little device that can be used as a safety and security is a battery disconnect switch. Battery drain occurs on every normal vehicle but it can be worse for some that have electrical problems. The batter disconnect switch can also be used to help you save money as it stops the drain on your battery while youre not in your truck. Can be used on race cars street rods boats heavy machinery or anywhere else you may need a master battery onoff switch.
Details about battery disconnect switch metal housing heavy duty for peterbilt kenworth freigh. For safety reasons battery cut off switches are a valuableand sometimes mandatedresource. 5699 jegs push pull battery disconnect switch compatible with 12 volt systems. It is designed to shut off all battery power. New heavy duty master battery disconnect onoff kill switch with red handle can be used on all semi trucks freightliner kenworth mack peterbilt etc. This will disable the remote.
There should be a series parallel switch close by the battery box which looks similar to these in attached pdf. 43 average based. Battery disconnect switch 2 terminal single pole single throw. If your kw is 24volt start 12volt run. There has been a few discussion here before on kenworth charging starting systems try and search back through the threads if no one else can help. The battery disconnect switch is designed to shut off any draw from the house batteries when not in use such as storage compartment lights interior lights and others.
Summit racing carries a large selection so you can find the battery kill switch you want. 6599 jegs faceplate for master disconnect switch 555 10305 555 103050. With a push of a button you can shut off the power from the battery so the car will not start. Prevents dead batteries theft and safer to work on vehicle with battery disconnected. Some manufacturers use a separate lead from the batteries to the lp leak detector which bypasses the disconnect so that can draw the batteries down as well. Kenworth peterbilt freightliner western star volvo mack internatonal ihc and various other heavy duty trucks.