73-87 Chevy _ GMC Trucks > Electrical

Battery cable replacement

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Rough75C20:
Hello,

Simple question just to double check. I want to replace the positive battery cable on my truck. The new cable doesn’t have the splice with the smaller cable that splits off to go to the back of the alternator. Can I just run a separate wire from the positive terminal to the back of the alternator instead of splicing it like the original cable with the red plastic box? Any idea what gauge this smaller wire needs to be? Should I add a fuse? The splice in the red box currently doesn’t have a fuse. The new setup would be just a large positive cable to the starter and a smaller wire going to the alternator directly from the positive terminal.

Thank you


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bd:
It is a simple enough question, but I need more information to provide a viable answer.  Does your question refer to your 1975 C20?  The '75 didn't originate from the factory with a B+ cable between the battery and alternator.  What do you mean by, "the original cable with the red plastic box?"  What is the current output rating of your alternator?  Providing year/model information, whether the charging system has been upgraded or modified, and posting a pic of how the truck is presently configured should help.

Rough75C20:
Hello bd,

The engine is an ‘82 305. Not sure amperage on the alternator. I’ll try to get a picture of it and post here shortly. It is some sort of junction block that splices the battery cable to the back of the alternator.

Thank you


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Rough75C20:
Here are some pictures of the setup


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bd:
None of the battery cable or the spliced jumper to alternator is original to the truck.  How many wires connect to the output post on the back of the alternator?  Is it just the one from the splice in the "red box?"

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