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12-18-2016, 04:33 PM | #1 |
Registered User
Join Date: May 2008
Location: Mesa, AZ
Posts: 281
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Re: No juice to starter
I suspect with the deep freeze across much of the U.S., and it being Christmas, you're likely to get few responses.
My material is not available at the moment, so I'll give you my $0.02 without those aids. But, looking at your pictures, it seems your engine room wiring has been "modified". So, no power to the starter nor to the coil? Let's take this one step at a time. 1. The engine has a large gauge wire connecting it to the negative terminal on the battery? 2. The starter solenoid has a large gauge wire connected to the positive terminal on the battery? 3. The starter solenoid has a small gauge wire connected to the "start" position of the ignition switch? Keep in mind, on the stock starter, there were at least two small terminals. One goes to the coil during starting. (We'll not worry about that terminal at the moment, just make sure you connect the correct terminal to the "start" position on the ignition switch.) That should get the starter cranking. The next set is to set up the coil. 4. The coil "negative" should be connected to the points, or points equivalent in the distributor. If your distributor has an electronic points replacement module, it'll need power! 5. The coil "positive" needs to be connected to the "on" position on the ignition switch. However, with most coils, to prevent excessive current from damaging the points, some sort of ballast resistor must be used. The stock wiring had a length of resistance wire in lieu of a ballast resistor. If your resistance wire has been replaced with a conventional wire, you'll have to provide a ballast resistor unless there is no need for it.
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12-18-2016, 07:46 PM | #2 | ||||||
Registered User
Join Date: Jun 2016
Location: Central California
Posts: 229
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Re: No juice to starter
Magma, Thank you for the detailed response.
The entire harness has been "heavily modified" to put it nicely, unfortunately. The truck has an MSD box and electronic ignition. Quote:
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Yes, because it is an aftermarket starter it only has the main terminal for the positive battery cable and one other small terminal for the ignition start position wire. Is there a sure way to test which wire is my ignition start position wire? I am fairly confident but would like to be 100%. Lastly, My starter worked perfect when I pulled it out. I do not have any reason to believe that it shouldn't work now. However, in the troubleshooting process I pulled the starter inspected it and tried to take a hot battery and some jumpers to verify the motor and bendix were engaging and I couldn't make it work. Shouldn't I have been able to jumper the small terminal and larger terminal together and put a 12v battery to it and get it going out of the truck? Something there doesn't make sense to me. Quote:
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1969 GMC K2500 |
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12-18-2016, 08:07 PM | #3 |
Senior Member
Join Date: Jan 2016
Location: massachusetts
Posts: 327
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Re: No juice to starter
Have some one help You with the ignition switch, use a volt meter or 12 volt test light to check the smaller wires--that should tell you something! Constant voltage to ignition and momentary voltage to starter!
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12-24-2016, 11:04 PM | #4 |
Registered User
Join Date: Jun 2016
Location: Central California
Posts: 229
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Re: No juice to starter
Update -
Okay so I'm halfway to figuring out the mystery. Upon installing the (new to me) engine it has taller valve covers than the last set. Because the valve covers were taller they came in contact with with the hot terminal on the alternator (serpentine setup) and did some damage to various electrical components. It burnt a wire in my starter which is why I wasn't getting any juice. Made the simple repair and now I've got the engine turning over so that's a good sign. From there I went on to check for power at the distributor.... Nothing. So I went inside the cab and pulled the ignition switch and it is getting power to the switch and I have power leaving the switch. Then, it started dumping down rain before I could do more testing so that is where I am at for now. Thinking my next thing to do will check to see if I have power before and after the msd box. If for some reason I screwed up the MSD box how hard would it be to bypass this? I have zero need for it with my current setup.... I'll keep you posted.
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1969 GMC K2500 |
12-25-2016, 12:44 AM | #5 |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,376
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Re: No juice to starter
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I'm coming in late here so I'll see if I can add a couple of things. If it hasn't been replaced with another color the heavy gauge Purple wire (10 or 12 gauge if I remember right) connects to the "S" terminal on the solenoid. If there is a smaller Yellow wire you may not need it with electronic ignition. The colors can be hard to see down by the starter so follow them up by the firewall to check the colors. Is your distributor an HEI or points with some kind of aftermarket unit? I don't know anything about MSD stuff.. LockDoc
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