Super Jet cranks slow no matter what battery is in it.

[Lake Erie Monster]

just as it says my 1990 superjet cranks slow no matter what battery is in it. i put a fresh battery in it and it still turns over slow. sugestions?

 

[sherm]

check your battery cables,grounds,starter,compression,pretty much the first points to check

 

[MADMAT]

Sounds like a starter IMO.

 

[Jayski]

jay

if its not cables, starter motor is shorting out...

 

[Matt_E]

Bad crank bearings can also cause this

 

[MADMAT]

Oh yea...crank bearings! I want to change my answer...

I recently had that happen..

 

[SJBrit]

Crank it for a few seconds and see if the starter cables are getting hot (one from the battery and one from the e-box). If so then I would check the cables first. Otherwise this could start getting expensive....

 

[WFO Speedracer]

The way to find the problem is by using a multimeter and doing a voltage drop test, I would try to explain this but this link does a much better job of it than I ever could. Basically you check voltage drop between every wire and wire connector till you find what component is causing an abnormal current draw, its probably your starter if you can freely turn the engine over by hand with the spark plugs removed.

http://www.aa1car.com/library/voltage_drop_testing.htm

 

[Lake Erie Monster]

thanks guys

 

[junkyardj]

could be pump bearings to, after checking your starter/and rolling motor with plugs out