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Old 11-21-2015   #2
Dynomite
 
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Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,816
Default Bench Testing the Starter

Quote:
Originally Posted by Vette73 View Post
Battery is good......Tried running a wire from the thick purple one ( starter wire ) to the positive battery cable...All I got was a spark....Tried cranking while someone held wire - no good....
Lifted coil packs and banged on starter just to see if it would crank- no good...

Don't think it's VATS security light goes off when you turn key....Don't think its clutch switch either....

At this point I'm hoping its is the starter because everything is basically apart..

Are there any other tests I can run to see if it is def. the starter?
If you really hot wired the purple wire and nothing.....then it is the starter Solenoid or Starter Grounding....remove the starter (simple if you already removed coil packs) and set it on the bench. Hot wire the starter (main battery cable connection and Solenoid connection with ground wire connected to starter housing) and see if starter gear spins. If the starter gear does not spin..... take starter apart and see what the issue is. If the starter does not click (Solenoid move) then the Solenoid circuit is the issue or stuck Solenoid. The Starter Solenoid is basically the electromagnetic switch which engages Battery direct power to the Starter Armature. The Starter Case is grounded to the Engine where the Starter is bolted to the rear of the Valley.

mgbrv8 Starter Disassembled Photos of LT5 Starter Parts (March 2013)


Starter, Starter Relay, Wiring Harness, Battery, and Plugs Tricks

The Starter Solenoid is shown in the left photo with slight burnt contacts in right photo.


The Solenoid contacts in left photo were wire brushed clean in right photo.
Also use a bit of emery cloth on the two fixed contacts.



Clean the Valley Drain at the bottom rear of the Valley if you remove the Starter.
Also....if you disassemble the Starter, check by spinning the two bearings at each end of the Starter Armature for smoothness (those two bearings are very easy to replace with new bearings) and obviously check the Armature Brushes for wear.

Last edited by Dynomite; 11-22-2015 at 07:11 AM.
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