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Old 06-20-2003, 06:00 PM   #1
70 CST 4X4
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Question 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.
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1970 CST K10 350/350/205
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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

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Old 06-20-2003, 06:08 PM   #2
Gee_Emm
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It is a dual battery isolator.
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Old 06-20-2003, 06:09 PM   #3
jef5150
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yea,sounds like what i have on my boat,its called a "perko"switch,battery isolater,
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Old 06-20-2003, 06:10 PM   #4
oldyeller
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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..
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check out the project old yeller
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Old 06-20-2003, 06:11 PM   #5
70 CST 4X4
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That is what I have been thinking that it is.
Does anyone have a picture of a stock one in an old truck?
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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

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Old 06-20-2003, 11:07 PM   #6
bpmcgee
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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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Old 06-23-2003, 01:09 PM   #7
70 CST 4X4
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ttt

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

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