73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Electrical => Topic started by: Jerr-conn on September 29, 2018, 02:49:26 pm
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Today I drove my 87 350/700r4 swb to a car show. When I went to leave, it would not start
Or turn over. Battery is 1 1/2 yrs old. Had it checked and it is good. Anyway, had it jumped
And it started right up. Drove all way home, no problem. Shut it off, let it set 5 minutes. No
Start. Even dome light would not light.crazy. Never had this prob before. I wonder if there
Could be a prob with neutral safety switch. Or something else? Any ideas? I hate wiring probs.
Thanks for any and all help.
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How old are the battery cables and are they secure at both ends?
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i just chased down a starting issue on my 02. think it turned out to be a loose connection on the battery. i would start there then go to the starter connection. since you have no dome light that would rule out any switch and since it started with a jump i would think a loose or poor connection at the battery
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Don't know about batt cable age.only owned truck almost 2 yrs. cables at batt are tight and
Meg ground is tight on block.don't know about pos cable to starter yet . Will ck tomorrow or mon
Thanks for advice so far. Question: is the neutral safety switch on col under dash?
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its not going to be the NSS due to you not having a dome light. ive also seen dual terminal batteries (top and side post) lose connection to one side (side post) but still have it to the top
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It might be a good time to disconnect and clean the cable connections to the battery and make sure that acid hasn't corroded the cable under its insulation.
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While you're at it, check the tightness of your fan belt. If it's loose you're not getting full voltage to charge the battery. Bad connection/loose belt=mrtruckisnothappy
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Well, did all mentioned above plus cables are like new, all tight. Still nothing. Even tried another batt.
Nothing. Dead as heck. If I take batt cable off and reinstall, the interior light comes on . Soon as I
Turn ignition key, it goes out. That's the only light that lights up, little as it does. Any other ideas
Or I will probably take it to a shop. Really don't want to do that, but. Thanks guys.
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Give all of the fusible links at the starter and firewall junction block a stout tug to see if any stretch or separate. Inspect the fusible link terminal ends and splices for visible evidence of heat damage such as blistering, melting or discoloration.
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Rich, never thought about fusible links. Not real familiar with trucks. Did not know there was one at starter also. Found the one on the firewall,But the one at starter must connect to solenoid. Is that right? Are they both the same and Replaced the same way? I'll have to jack up truck to ck starter link. Probably have to drop starter if that's the bad one.Will let you know. after thinking about this,
I don't remember cars having a starter fusible link. Do I really need this one? I ck' the upper link and It looks good. Will ck starter link later. Jerry
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Jerry, there should be two fuse links at the starter connecting to the B+ solenoid stud along with the battery cable. The locations, lengths and gauges of the links are crucial to protect the main bus routing. DO NOT eliminate them! They serve as primary circuit protection for the entire electrical system and prevent catastrophic electrical fires. Fusible links are consistently 6" in length but vary in gauge according to the wires they protect. There is an industry standard formula to determine proper gauging that is expressed in the thread How to make a Fusible Link (http://forum.73-87chevytrucks.com/smforum/index.php?topic=11972.0). If there are any questions, I'll be happy to answer them.
You shouldn't need to drop the starter, but disconnecting the battery ground cable before using any tools to access the solenoid is a smart move. Many automobiles also use fusible links in various locations around the vehicle depending on brand, model and year. Links are used instead of fuses because of their suitability to location, low cost, durability and tolerance to current surges that would otherwise melt conventional fuses.
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UPDATE---ck'd fusible link at firewall. Ck'd good. Wanted to check starter fuses, but
I'm 80 years old and did not feel like Crawling under truck, so I had it hauled to this
garage that I trust a lot. They called next day and found problem. It was a pinched
fusible link at the starter. Evidently, before I got the truck, someone replaced the
starter, and didn't ck wiring when installing new starter. Garage replaced bad link and
re-routed wiring to eliminate any further problems. $95 later, it was money well spent.
Thanks to B D and all, for your help and ideas. Jerry
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Glad to hear that you got it resolved! :)