What could this be? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

70 CST 4X4 · 06-20-2003, 06:00 PM

Sorry I don't have a picture to post yet but will soon. This part was mounted in the engine compartment ,to the left side of the truck. It was bolted next to my battery holder on the left side (truck came with dual batteries) on the fender above the fender well. It is one big heat sink, has 3 posts each maked B1,A,B2. Measures roughly 4"x3"x2.5". It had 2 red wires going to the A post that were live, and the 2 "B" posts each read same voltage as the A post.Nothing was hooked up to the B posts. Is this an isolator for the dual battery setup ? Truck did't have a second battery hooked up when I got it.I did not find any battery clamps for one either. Hope I explained it well enough. Any help would be great.

I will post a picture as soon as I can.

*Gee_Emm* · 06-20-2003, 06:08 PM

It is a dual battery isolator.

jef5150 · 06-20-2003, 06:09 PM

yea,sounds like what i have on my boat,its called a "perko"switch,battery isolater,

oldyeller · 06-20-2003, 06:10 PM

Quote:

Is this an isolator for the dual battery setup ?

thats what it sounds like it is to me. the terminals are self explanitory, just be sure to hook the ground up on the second battery, connect it to the frame or engine depending on what you are going to do with it..

70 CST 4X4 · 06-20-2003, 06:11 PM

That is what I have been thinking that it is.
Does anyone have a picture of a stock one in an old truck?

bpmcgee · 06-20-2003, 11:07 PM

Seeing that two wires were going to the "A" post, I'd guess that the switch has been bypassed. I imagine that normal installation would be a battery to B1, battery to B2 and A going out to the starter.

Brian

70 CST 4X4 · 06-23-2003, 01:09 PM

ttt

Anyone have a picture of one of these in their truck?

06-20-2003, 06:00 PM	#1
70 CST 4X4 Have A Nice Day! Join Date: May 2003 Location: California Posts: 355	What could this be? Sorry I don't have a picture to post yet but will soon. This part was mounted in the engine compartment ,to the left side of the truck. It was bolted next to my battery holder on the left side (truck came with dual batteries) on the fender above the fender well. It is one big heat sink, has 3 posts each maked B1,A,B2. Measures roughly 4"x3"x2.5". It had 2 red wires going to the A post that were live, and the 2 "B" posts each read same voltage as the A post.Nothing was hooked up to the B posts. Is this an isolator for the dual battery setup ? Truck did't have a second battery hooked up when I got it.I did not find any battery clamps for one either. Hope I explained it well enough. Any help would be great. I will post a picture as soon as I can. __________________ 1970 CST K10 350/350/205 Short Bed - Fleetside Tach-Tilt-A/C-Tow Hooks Front & Rear Disc Brakes Front & Rear Posi 3.73 Gears 30 Gallon Stainless Fuel Tank SOLD 01/18 !!!!! 2007 2500 HD Classic Crew Cab LT2 4X4 Duramax LBZ

06-20-2003, 06:11 PM	#5
70 CST 4X4 Have A Nice Day! Join Date: May 2003 Location: California Posts: 355	That is what I have been thinking that it is. Does anyone have a picture of a stock one in an old truck? __________________ 1970 CST K10 350/350/205 Short Bed - Fleetside Tach-Tilt-A/C-Tow Hooks Front & Rear Disc Brakes Front & Rear Posi 3.73 Gears 30 Gallon Stainless Fuel Tank SOLD 01/18 !!!!! 2007 2500 HD Classic Crew Cab LT2 4X4 Duramax LBZ

06-23-2003, 01:09 PM	#7
70 CST 4X4 Have A Nice Day! Join Date: May 2003 Location: California Posts: 355	ttt Anyone have a picture of one of these in their truck? __________________ 1970 CST K10 350/350/205 Short Bed - Fleetside Tach-Tilt-A/C-Tow Hooks Front & Rear Disc Brakes Front & Rear Posi 3.73 Gears 30 Gallon Stainless Fuel Tank SOLD 01/18 !!!!! 2007 2500 HD Classic Crew Cab LT2 4X4 Duramax LBZ

06-20-2003, 06:08 PM	#2
Gee_Emm Account Suspended Join Date: Sep 2000 Posts: 3,991	It is a dual battery isolator.

06-20-2003, 06:09 PM	#3
jef5150 Inline 69 Join Date: Apr 2003 Location: valleysprings,california Posts: 1,018	yea,sounds like what i have on my boat,its called a "perko"switch,battery isolater,

06-20-2003, 11:07 PM	#6
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Seeing that two wires were going to the "A" post, I'd guess that the switch has been bypassed. I imagine that normal installation would be a battery to B1, battery to B2 and A going out to the starter. Brian



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