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post #1 of 12 Old 04-21-2019, 12:23 AM Thread Starter
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Starting issues

I just picked up an 83 s10 over the winter with a carbureted 350 in it. The truck will start if I have a jumper box on it but wont without it. The voltage will drop from 13s to 5 while it is cranking then go back up to 13 when I let off the key. I replaced all thr connections at the battery and a new ground wire to the block. It will crank but acts like dead battery. As soon as I put the jumper box on it it will fire right up. I've tried 3 batteries and all the same results. Could it be the starter draining too much or a wiring issue?
Thanks in advance.

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post #2 of 12 Old 04-21-2019, 05:31 AM
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Re: Starting issues

check the rest of the grounds- sounds like the coil is not getting enough power while cranking , and check the cable ends(under the plastic) at the battery

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post #3 of 12 Old 04-21-2019, 07:07 AM
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Re: Starting issues

Is the battery relocated with too small of a cable? Does the ground go directly to the block?
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post #4 of 12 Old 04-21-2019, 08:48 AM
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post #5 of 12 Old 04-21-2019, 02:40 PM Thread Starter
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The battery is in the original spot,I just put a new 4 guage wire about 2 foot long to the engine block. I checked with my meter and without cranking the ground from the battery to the block reads 0.00 and while cranking it jumps up just a little .
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post #6 of 12 Old 04-21-2019, 09:51 PM
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Re: Starting issues

Same on the positive side? If so, then probably the starter. Or that engine is very hard to turn over for some reason. Try putting a socket on the front crank pulley. It should rotate with a moderate amount of force. You'll feel the compression stroke of each cylinder as increased resistance, but it should still rotate w/o using a long bar and a pipe,
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post #7 of 12 Old 04-21-2019, 11:44 PM Thread Starter
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The positive side drops from 13.? Down to 5.? When its cranking. I'll have to try a bar when I get home. The guy i got it from said it does have a different cam if that makes any difference.
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post #8 of 12 Old 04-22-2019, 07:05 AM
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Re: Starting issues

Did he say which cam or the specs? Shouldn't really make that much difference.
Test the resistance of the positive cable w/o power. It should be nearly nothing.
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post #9 of 12 Old 04-22-2019, 07:49 AM
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Re: Starting issues

pull cable ends of starter- check voltage, then disco battery and check resistance- should be full voltage/ near zero resistance- drop starter and take to parts store and have checked- while apart- clean cable ends- if starter good- check contact bolts for rust and clean. make sure you have ground wires from rear of block (2) to firewall. also check batt to frame ground.

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post #10 of 12 Old 04-22-2019, 07:10 PM Thread Starter
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I put a ratchet on it and it turns but takes alot to move it.
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post #11 of 12 Old 04-22-2019, 07:37 PM
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Re: Starting issues

It's going to take some effort since you're going thru the compression cycles.

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post #12 of 12 Old 04-22-2019, 11:01 PM
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Re: Starting issues

If you can turn it with some effort with a ratchet, that sounds about normal for a 350. Drop the starter. I've seen a lot of swaps where the PO thought he needed to install some super starter off ebay. A good OEM late model starter works better IMHO.
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