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Old 09-11-2012, 09:30 PM
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327 Engine cranks but won't start after electric fan install!

Make: Chevy
Model: Impala
Engine: 327
Tran: 350 Auto
Coil: Mallory Electronic
Distributor: Mallory Electronic

Background:

1. Installed electric fan (see attachment "spal fan wiring" file).
2. During initial startup of engine, heard fan power up for 1 or 2 secs., then power off. Engine cranked over, but did not start.
3. Eliminated fan electrical configuration entirely during trouble shooting.
Tested fan manually, fuse never blew, fan works fine.
4. Car was running prior to install with this config (img2 attachment).

Question(s): Any tests I can run with a voltage meter to narrow the
issue.
Is the fan wiring config ok?
Please keep in mind I have very little experience with
electrical, so be very specific.

Car has gas, battery volts at 12.5, no obvious wires burnt.
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Old 09-11-2012, 11:07 PM
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fan should be grounded to frame, and relay should be ground to frame,... not, fan neg. to relay neg,
pin 85 to chassis ground, pin 86 to switched +,(either a toggle switch or a temp switch)
pin 30 to battery. pin 87 to + fan. I think fan tried to pull amps through relay on your switchedside...so.... youmay have a blown fuse at the fuse block or even blew your fusible link for ignition...check volts at alternator nad coil..then youll know.
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Old 09-12-2012, 03:48 AM
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Your diagram is fine, it appears that you are grounded to the battery, weahther that's via the frame, wire, etc really doesn't matter.

I think your issue may be the pwr suppy to your ing coil or ing module. Depending on what you hooked the fuse box lead to, you might have spiked the ing module. Most parts store will test it for free.

Another member posted this link on testing the ing components yesterday it's

http://api.viglink.com/api/click?for...13474435421561

Last edited by EOD Guy; 09-12-2012 at 03:54 AM.
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Old 09-12-2012, 08:38 AM
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Follow-up

Both grounds are at the frame, my configuration chart is somewhat misleading!
I will have the ing module tested as suggested.

What would cause the spike?

On my coil/resistor configuration (img2 attachment file), I have the 12v hot wire from the ignition fuse box side going into one side of the resistor and the other end of the resistor leads to the negative side of the coil, would this be a "normal" or acceptable configuration? I've been running the car with this configuration for a while with no issues, battery does hold a charge
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Old 09-12-2012, 04:05 PM
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Battery not holding a charge could be a couple of things..... Did you recently replace the alt or re-wire the leads to the alt or tie in to the lead from the alt? Have the battery tested to make sure it's still good, Have the alt tested to make sure it's good, verify the leads to the alt are correct (not by looking at the but using a test lead, multimeter etc....) The #1 wire goes to the exciter wire or a switched pos 12v (that's not hooked to the dizzy supply wire) and the #2 wire goes to the pos side of the electrical system, if they got switched somewhere it will drain your battery in about a day etc....
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