Right fed up with my electrics now!

Robin Webster

Robin Webster

Hero member
Location
Silverstone
So built the 500 Barcelona and racing it in BEARs. Check out LeeHollickphotography.zenfolio.com I'm number 270.

I've had starter motor problems all season. Gone through three solenoids.
Two batteries.
Three and a half starter buttons!

Had one of the little solid batteries on and melted it.

Put a Motobatt MBTX14AU on it now.

Bought a recommended solenoid from a K75 BMW and two stopped working.

Put a push on instant off race car starter button on it. Wired directly to the starter motor.  It stopped working on the line at Darley Moor.

Put a chrome electric on off toggle switch on it. Wired directly to the starter motor. Melted it at Three Sisters
Bought a KTM starter button, put it on tonight. Wired directly to the starter motor. It got very hot and I pulled the wires quickly.

So, is my starter using too much juice and needs new bushes???

Am I doing it wrong to wire switch in circuit with the starter motor?

Is the battery too much?

Why when I used a solenoid was I knackerring them too?

Should I buy a solenoid off a Laverda combine harvester!!!

Help!

Robin

:(
 
Robin,

No way a normal switch/button will transmit the necessary current for your starter without terminal melt-down... the starter will draw in excess of 200 amps while churning the engine, normal switches are rated at around 10 amp max!

Use a relay/solenoid with proper cross-section wiring from battery to relay and relay to starter.  A generic solenoid from any middleweight jap will do fine.

If the starter remains sluggish, tear it apart and check internal condition.  A good clean-out often works wonders!  The commutator might require skimming, with new brushes it should have your engine running at a touch of the button!

Not unknown to have brand new batteries go crook either... :o

piet
 
It turns over fine as it is, just putting it out there that it might be pulling too much juice. If I pull it out and connect a battery charger to it o n the floor it REALY jumps!

Don't REALY think that's the problem..

Why has it burnt out the solenoids? Two Bosch ones and one from a Mercedes Benz car!

Robin.  >:(
 
Sounds promising.

Hook up an ammeter to check just how much it is pulling... could be anywhere around 80-150 amps without load.

Look for an old Lucas car solenoid, fitted to Minis and other British Leyland/BMC rubbish vehicles at one stage iIrc.  Were used in early SF and SF1 750s too, just about bulletproof.

piet
 
Yeh but it does not tick over and when you get long delays between races as someone has thrown it up the road in the previous race, it stalls.

And no, I don't want to be bumping it.

Robin.  :o
 
Hi Robin - Have had  s/motors appear to draw an excess current when not all 4 brushes are making contact with the commutator. Sometimes they are just seized in their holders and it's a simple job to free them - or replace if too short - regards - Phil
 
phil37 said:
Have had  s/motors appear to draw an excess current when not all 4 brushes are making contact with the commutator. Sometimes they are just seized in their holders and it's a simple job to free them
Click to expand...

Had the same problem with brand new startermotor and battery.

Hein
 
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