starter solenoid issues

[garth mc garth]

whilst changing a battery lead on the mog the other day the cap on the starter solenoid split in 2 around the terminal pole. i replaced it with another solenoid exactly the same dimensions, voltage etc but with a different part number but told was a compatible part.

now when i connect the battery terminal the starter engages on its own?? i tried it with ignition wire disconnected and it still does it???? any ideas?

[Stephen Blair]

have you maybe got a 24v one??

[niftysteve]

is the solonoid shorting out somehow when you re fit the metal cover on the starter

[Dean Lofthouse]

You may have got your wiring wrong.

 

Solonoids should show no circuit through the big terminals if you connect a multimeter to them, if it shows a circuit then the solonoid is faulty

[garth mc garth]

its 2 main poles. 1st is the motor supply and the 2nd is the battery positive lead which also has the alternator output wire on and finally it has a small screw terminal at the side which the ignition wire connects to.

been checking through wiring diagrams and all i have done is correct, starting was never an issue with old solenoid but this has me baffled, i thought perhaps the contacts could be stuck inside the solenoid but if the ignition wire is disconnected then surely it wouldnt engage

[Dean Lofthouse]

It's got to be stuck engaged then, no other explanation

[J The Tree]

You may have the 2 big terminals on the solenoid connected the wrong way around- easy done

[MRstump]

i agree with that, youve got the wires on the wrong way round! very easy mistake

[Mesterh]

You could have replaced the solenoid the wrong way round, therefore the wires look right but aint.

[garth mc garth]

the terminals have different sized poles so will only fit the leads and wiring one way unless you took a drill to them and reamed the ring connectors out, i dont remember doing this so i decided to pull the guts out the new solenoid tonight and found the so called "new" solenoid was rusty inside and the terminals had stuck in the engaged position.