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Old 07-09-2017, 06:00 PM   #16
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Re: 01 4.3L won't turn over

Is there 12V present at the 10A CRANK fuse in the Underhood Electrical Center (UEC) when the key is turned to the crank position?
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Old 07-09-2017, 08:29 PM   #17
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Re: 01 4.3L won't turn over

I'll check it when I get home from work tomorrow and let you know
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Old 07-10-2017, 06:05 PM   #18
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Re: 01 4.3L won't turn over

Okay, I haven't charged the battery in a while. It reading 10.1V. The 10 amp crank fuse is reading 9.5V when the key is turned to the start position.
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Old 07-10-2017, 07:01 PM   #19
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Re: 01 4.3L won't turn over

So the CRANK fuse is getting whatever little battery voltage is available. That likely rules out the ignition switch and everything upstream of that.

The next place to test voltage is at the STARTER relay in the UEC. The contact for Pin 85 on that relay should get 12V when the key is turned to the crank position. If not, go backward to investigate the Park/Neutral switch on the side of the transmission.

Use care in disconnecting the plug for that switch. The factory used a melting sealant on that connector to help keep moisture and grit out of it. It helps to use a heat gun/hair dryer to warm the switch and connector up to about 150° to soften the sealant before disconnecting it.
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Old 07-10-2017, 09:19 PM   #20
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Re: 01 4.3L won't turn over

Ive already replaced the neutral safety switch, wish I would have known about the sealant, it took a little effort getting the connectors off. I'll check the relay tomorrow and get back with you, thanks for the help.

Last edited by MDSK440; 07-10-2017 at 09:24 PM. Reason: More info
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Old 07-11-2017, 05:13 PM   #21
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Re: 01 4.3L won't turn over

I checked the relay, the bottom right, which I'm assuming is pin 85 shows 9.5V when the key is turned to the start position.
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Old 07-11-2017, 07:02 PM   #22
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Re: 01 4.3L won't turn over

If the battery is fully charged that voltage should be much closer to 12. As long as there is battery voltage present that relay should be operating. If the relay is operating, the starter should operate.
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Old 08-19-2017, 08:25 PM   #23
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Re: 01 4.3L won't turn over

Still working on it. No luck yet.
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