Originally Posted by olds48

What kind of disconnect do you have and how old is it?Some of them are not rated for the amperage it takes to start a car.746 watts equals one hp.Watts divided by voltage equals amps.So..if you have a mini starter rated at 2 hp that is 1492 watts.1492 watts divided by 12 volts is 124 amps!!If your voltage drops to 8 volts(which is not that uncommon if you watch your gauge) it would be 184 amps.ALOT of the cut-off swithches people use are only rated at 20 amps continous and 200 amps intermittent.Not much of a switch considering all the electronics some guys run.Water pump,elec fan,ign box(which is not much),1 or 2 fuel pumps,and then when you pull your lights on at night...20 amp switch barely covers your head/tail lights.doesn't take long to max out one of those babies.Check your switch.If it being overworked it could be losing alot of voltage where it has been overheated from over-amperage.Might be cheaper than buying alot of cable.Moroso makes a severe duty switch rated at 2,000 amps intermittent and 300 amps constant.Goes for about $60.Just a thought :?

Originally Posted by olds48

It's what I do for a livin' :D They made me learn it :(