Wont start worth a crap when cold (I know there are threads, but just read) - Ford Powerstroke Diesel Forum
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Old 11-13-2013, 10:59 PM
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Wont start worth a crap when cold (I know there are threads, but just read)

I gat this truck 3 years ago. After the first winter I put a new GPR from NAPA in it and a new block heater. The following summer I put new Glow plugs in it. Last winter I put 2 new NAPA batteries in it, plus a new starter & new alternator.
You would think I should be good to go. Every time it gets down to the low 50's, it's sluggish at starting. But starts.
Yesterday it was 40 out and wouldn't start. Bogged down after I cycled GP's twice and acted like I had dead batteries.

What can I look at now to make this thing start when it's cold?
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Old 11-13-2013, 11:13 PM
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If you are spinning too slowly itll be tough to start regardless so I have some suggestions based on my own truck.

Test that NAPA relay, they aren't known for longevity.

Check out your battery cables, every SD I've seen uses a open terminal on the starter, this means your starter cable looks like crap after just a few years.

I built my own on my E99 out of 3/0 with crimped closed terminals and it made a HUGE difference.
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Old 11-13-2013, 11:26 PM
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Ok, Thanks Ill probably replace the starter cable reguardless then.
How do I test the relay? It hums and makes a click noise after about 30 seconds.
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Old 11-14-2013, 12:33 AM
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Get a voltmeter and a buddy. Have your buddy turn the key forward while you test the voltage across the big terminals. Should read the same as your battery voltage.
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Old 11-14-2013, 12:35 AM
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Ok. I will do that today.
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Old 11-14-2013, 09:48 AM
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With the key "off" the voltage across the BIG terminals is 12v. When the key is turned "forward" it goes to .005v.
Is this right?
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Old 11-14-2013, 09:59 AM
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CORRECTION.
I didnt know how to do the measurement, so I looked it up.
From one terminal it had 12.3v with key "off". The other had 0v.
With key "on" I had 12v on one terminal (original 12.3v one) and had 10-9.9v on the other.

Is this bad? Since its lower on Voltage than the other?
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Old 11-14-2013, 10:17 AM
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The way to test it is to put the ground lead of the test meter to a good ground, then have some one turn the key on, then touch each of the big terminals and compare the two numbers. They should be the same or damn near the same otherwise the relay is toast
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Old 11-14-2013, 12:36 PM
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Well there is my numbers. 12 & 9.9. Is that close?
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Old 11-14-2013, 12:41 PM
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Quote:
Originally Posted by r_marczak_83 View Post
Well there is my numbers. 12 & 9.9. Is that close?
Nope relay is toast, Minimum i would say is 11v Replace it with this relay Western Plow GPR Relay
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