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starter motor solinoid continually failing

For all things Electrical.

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starter motor solinoid continually failing

Post by ANDREWGQ 351 »

I have a small bosh starter from a late model falcon currently starting my 351, the starter does a great job but Ii am replacing the solinoid around every 6 months. After 5 months of use i just get nothing when turning the key, no click just nothing, I try a few times then it turns over and starts as if there was no problem. This happens for a week or two then it can only be started using a screwdriver on the terminals.
I have changed 3 now, 1st brand new, 2nd 6 months old, 3rd who knows from wrecker, all only last 6 months or so each.
Any thoughts appreciated,
I have changed the cable to a softer more flexible one thinking that the old one may have been stressing the treminals but no luck so far
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Post by its aford not a nissan »

heat from the extractors killing them, might need a heat shield
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Post by Red04VXE »

its aford not a nissan wrote:heat from the extractors killing them, might need a heat shield
x 2

Are they v8 ones or modified 6cyl ones?


Get a Castle Auto Electrics one :armsup: :armsup:
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Post by ANDREWGQ 351 »

It has std manifolds so they are quite high, also the solinoid is rotated so its the lowest part so should get lots of fresh air. when i pull apart there seems to be nothing wrong with any part either the motor or the solinoid. I change the solinoid and its all good for another 6 months.

It is a std 6cly one, and fits straight in just using a spacer.

how are the castle auto ones different
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Post by 4runner_boy »

Are you using a relay to switch the solenoid,if not you may be getting voltage drop through the start circuit.
If you can still start it by bridging the start terminal and the b+ stud there is nothing wrong the solenoid,When it plays up check the voltage at the switch terminal and it should be more than 10V ish.
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Post by ANDREWGQ 351 »

When it does fail and I use a screwdriver to start I either get the passenger to turn the key as the solinoid will plunge out then I bridge the main battery lead to the motor power terminal. if alone then I need to bridge all three which requires 2 screwdrivers
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Post by not stock »

I brought a little high torque starter off ebay for $125,has been in there for 9 months and never missed a beat .Bargain.
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Post by ANDREWGQ 351 »

I am using the little high torque ones not the old style
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