Bump

Well-Known Member
Events Planner
If i take my starter motor off, connect to battery it works perfectly.

If i put starter motor on, connect to battery it won't start. starter motor solenoid clicks in, not a lot else, occasional sluggish sound of it trying to turn, but, not a lot.

Engine cranks over using socket on front pulley so nothing seized.

So, what do i try next? If it works off but not on, what's changing? :confused:
 
Mine did that, figured it was the fact it would work with no load but didnt have the guts to turn the engine over. Put another on and its fine :)
 
Battery/engine/chassis earth?

Connecting directly to it (all be it via jump leads) when on so by passing all vehicle electrics and still the same (actually it causes the heavy duty jump leads to smoke :/ )

Mine did that, figured it was the fact it would work with no load but didnt have the guts to turn the engine over. Put another on and its fine :)

Ah bugger, i didn't want to hear that - i've just paid to have a new solenoid put on it :(
 
Easy to check if it's an earth issue. Just run a jump lead from battery -ve to a decent place on the engine.

Another possibility is corrosion in the main feed cable which increases resistance, you can check that with a jump lead from battery +ve anorl though getting a croc clip on the starter connection is usually interesting
 
Connecting directly to it (all be it via jump leads) when on so by passing all vehicle electrics and still the same (actually it causes the heavy duty jump leads to smoke :/ )

:eek: You're drawing some serious amounts of current there.
 
Connecting directly to it (all be it via jump leads) when on so by passing all vehicle electrics and still the same (actually it causes the heavy duty jump leads to smoke :/ )



Ah bugger, i didn't want to hear that - i've just paid to have a new solenoid put on it :(

Ah, just caught up with your posts.

Does sound like the starters fooked :(
 
I usually bench test and try and stall it with a lump of wood by ramming it into the drive gear while running.
causes plenty of smoke and looks a bit heath robinson, but found a few I could stall before fitting to motor!
possible a weak brush spring/crud in brush holders. current flows but your getting limited magnetic fields to turn under load.
 
Cheers, definitely sounds like my starter is dead then :(

Ah well, least i have a spare solenoid now! Always a silver lining!
 
The motor being able to spin up with no load but stalling under load with excessive current being drawn certainly sounds like you have some of the turns of wire inside it, on the armature have gone short circuit. It's a fairly well known fault which can happen with any device where there are loads of wire wound very closely together, such as motors, generators and transformers.
The only options are to either replace the starter motor or to get it refurbished and the armature rewound.
 
£50 to get it refurbed ;)

£100 get's me a brand new one delivered to the door... :D

The motor being able to spin up with no load but stalling under load with excessive current being drawn certainly sounds like you have some of the turns of wire inside it, on the armature have gone short circuit. It's a fairly well known fault which can happen with any device where there are loads of wire wound very closely together, such as motors, generators and transformers.
The only options are to either replace the starter motor or to get it refurbished and the armature rewound.

Thanks for the explanaiton. Being an Engineer i like technical explanations :D
 
£100 get's me a brand new one delivered to the door... :D



Thanks for the explanaiton. Being an Engineer i like technical explanations :D

wallop it with a cranking 'andle, see it it clouts the brushes back onto the com :D
 
The motor being able to spin up with no load but stalling under load with excessive current being drawn certainly sounds like you have some of the turns of wire inside it, on the armature have gone short circuit. It's a fairly well known fault which can happen with any device where there are loads of wire wound very closely together, such as motors, generators and transformers.
The only options are to either replace the starter motor or to get it refurbished and the armature rewound.

£100 get's me a brand new one delivered to the door... :D



Thanks for the explanaiton. Being an Engineer i like technical explanations :D
It's also not unknown for play in the bearings to allow the armature to contact the field coils when under load, happened on my tractor.
 

Similar threads