Getting spark when key is released
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
Sounds like a wiring nightmare, let me throw a much simpler thought in here. If the starter motor pulls too much current, there is nothing left for the ignition system, untill the key is released. The same can hold true for a battery not up to par. I like to start simple then jump into the maze as we might call it. kotzy
Posting Guru
Joined: Jun 2008
Posts: 1,124
Likes: 0
From: Buckeye, AZ
A rule of thumb from what I learned is 1 tenth of a volt loss per connection.
If you are concerned about voltage loss to system start first by setting DVOM meter for the ground lead to be attached to ground post of battery then engadge starter, while checking voltage at bat post center, bat on solenoid, starter side of solenoid and last but not least red wire going into coil.
Starter term at starter should be checked but have limited time as can't stay on starter longer than 45 seconds.
Battery shouldn't normaly fall under 10 volts durring this test and should remain steady if fully charged.
I would then hook the positive lead from the DVOM to positive term of the battery and while cranking again start at the motor block with the test lead and come back to the negative terminal also include body grounds in this test.
Finnishing the positive side test with the engine cranking from the key checking the red wire into coil should be within this outline because there is no resistance curcuit on start position.
I have also seen on a lot of newer Rangers, Exsplorer line is the ground cable bolted to one lug on the starter mount.
If still slow start checking lower start cable and starter by whatever means possible should weed that out including if the ground cable goes to the block that the starter mounting is clean and tight.
Doe's the 88 Bronco II ECM for automatic look for rpm and vss signal to determine torque converter lock up pass or fail?
Last but not least no accurate resistance can be measured with voltage present.
If you are concerned about voltage loss to system start first by setting DVOM meter for the ground lead to be attached to ground post of battery then engadge starter, while checking voltage at bat post center, bat on solenoid, starter side of solenoid and last but not least red wire going into coil.
Starter term at starter should be checked but have limited time as can't stay on starter longer than 45 seconds.
Battery shouldn't normaly fall under 10 volts durring this test and should remain steady if fully charged.
I would then hook the positive lead from the DVOM to positive term of the battery and while cranking again start at the motor block with the test lead and come back to the negative terminal also include body grounds in this test.
Finnishing the positive side test with the engine cranking from the key checking the red wire into coil should be within this outline because there is no resistance curcuit on start position.
I have also seen on a lot of newer Rangers, Exsplorer line is the ground cable bolted to one lug on the starter mount.
If still slow start checking lower start cable and starter by whatever means possible should weed that out including if the ground cable goes to the block that the starter mounting is clean and tight.
Doe's the 88 Bronco II ECM for automatic look for rpm and vss signal to determine torque converter lock up pass or fail?
Last but not least no accurate resistance can be measured with voltage present.
