where is the brake warning switch? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tphsmith · 09-28-2007, 06:17 PM

looking at wiring schematics (my truck is a 72) I see from the engine compartment fire wall bulk head connectors. the connector on the left side of the bulkhead (standing in front of the truck looking at the fire wall) the very top left of the connector is a tan wire 20 gauge. in the wiring schematics it calls this wire #33 and the discription says its for Warning light brake alarm and says its a switch. PLEASE help me out where is this switch located on the truck?

Longhorn Man · 09-28-2007, 06:20 PM

proportioning valve... the block under/to the left of the master cylinder

tphsmith · 09-28-2007, 06:36 PM

thank you Longhorn Man... errr now I will put my beer down and look at the plug better.what you just explained is exactly what I have it labeled. the darn wire I needed to ask about is the same large connector on the bulk head but this wire is in the bottom left its brown with white line in it and its a 18 gauge wire the discription reads "Feed ign. Switch.Asscy. Controlled fused" what does this do and where does it go? is it for the TSC delay relay? for transmision shift control? and if Im putting a 700R tranny in the 72 do I need to use this feed?

09-28-2007, 06:17 PM	#1
tphsmith still buypickupparts Join Date: Sep 2003 Location: charlotte Posts: 637	where is the brake warning switch? looking at wiring schematics (my truck is a 72) I see from the engine compartment fire wall bulk head connectors. the connector on the left side of the bulkhead (standing in front of the truck looking at the fire wall) the very top left of the connector is a tan wire 20 gauge. in the wiring schematics it calls this wire #33 and the discription says its for Warning light brake alarm and says its a switch. PLEASE help me out where is this switch located on the truck? __________________ Its Gonna be a Great Day, I woke up this Morning. 72 SWB Fleetside freshly painted. putting a 94 LT1 with 700R4 tranny lowered 4 in the front 6 in the back 81 chevy half ton 350 89 Silverado 4x4 going ta church truck

09-28-2007, 06:20 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: where is the brake warning switch? proportioning valve... the block under/to the left of the master cylinder

09-28-2007, 06:36 PM	#3
tphsmith still buypickupparts Join Date: Sep 2003 Location: charlotte Posts: 637	Re: where is the brake warning switch? thank you Longhorn Man... errr now I will put my beer down and look at the plug better.what you just explained is exactly what I have it labeled. the darn wire I needed to ask about is the same large connector on the bulk head but this wire is in the bottom left its brown with white line in it and its a 18 gauge wire the discription reads "Feed ign. Switch.Asscy. Controlled fused" what does this do and where does it go? is it for the TSC delay relay? for transmision shift control? and if Im putting a 700R tranny in the 72 do I need to use this feed? __________________ Its Gonna be a Great Day, I woke up this Morning. 72 SWB Fleetside freshly painted. putting a 94 LT1 with 700R4 tranny lowered 4 in the front 6 in the back 81 chevy half ton 350 89 Silverado 4x4 going ta church truck



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