Does it have an On/Off switch for the Jumper?

No! The clamps suck and loose their grip. Mine fell out of the holder, shorted out and caught my trunk on fire. Burned the jump pack, the contents of my trunk, carpet, and damn near burned my car to the ground! Extremely dangerous without a master shutoff switch!!

Would this product jump start heavy equipment such as a semi?

My husband uses ours to start his backhoe.

Should I be leaving this plugged in at all times? Just investigating as to anything that could be sucking juice to increase my electric bill

I've owned the 1500 amp for about 12 years and it still works like new. Almost unbelievable. Strong and will start a large V8 engine with plenty of power left. I have left it plugged in for months at a time with no harm, however I agree that bringing it to a full charge and then unplugging it seems best. It will hold a full charge for months. I am ordering an additional one and hope it is still made the same as my original. My first one is an amazing product.

ASIN	B0002SQTZ0
Amperage	3000 Amps
Automotive Fit Type	Universal Fit
Best Sellers Rank	#3,582 in Automotive ( See Top 100 in Automotive ) #56 in Jump Starters
Brand	Clore Automotive
Customer Reviews	4.5 4.5 out of 5 stars (5,356)
Date First Available	August 11, 2004
Global Trade Identification Number	00010271012824
Is Discontinued By Manufacturer	No
Item Weight	44 pounds
Item model number	ES1224
Manufacturer	Clore Automotive
Manufacturer Part Number	ES1224
Model	Clore Automotive
National Stock Number	6130-01-481-4423
Peak Output Current	3000 Amps
Product Dimensions	6"D x 13.25"W x 15"H
UPC	010271012824

Clore Automotive Truck PAC ES1224 3000/1500 Peak Amp 12/24V Jump Starter

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