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04-26-2021, 08:11 PM | #1 |
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Join Date: Mar 2009
Location: Vancouver, WA
Posts: 111
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72 battery cable connection
Is this the correct battery connection layout for a 72 350 engine with A/C? The reason I ask is when I hook up the battery cables and plug in the horn it goes off and does not stop until unplugged. Also when I plug it back it does not sound but when the small cable by the fusible link is moved it makes the horn sound off again. I think I have a wire misplaced.
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Vancouver Bob |
04-27-2021, 07:04 PM | #2 |
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Join Date: Nov 2009
Location: Sherman, ME
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Re: 72 battery cable connection
Yes, that wiring appears to be hooked up correctly. The small black wire with the rubber inline fuse holder is part of the battery gauge circuit.
That red wire from the positive battery terminal (and fusible link) do supply power to the horn relay. But they don't have anything to do with triggering the relay. For that, there should be black wire inside the cab / under-dash harness that runs from a terminal on the horn relay up through the steering column to the horn button. If that wire is accidentally shorted to ground anywhere along it's length, or the horn button is sticking, it could be keeping the horn relay activated all the time, which in turn feeds power to the horn all the time. Or it could be that the horn relay contacts are getting stuck and continuously powering the horn. Moving or wiggling the wires near the battery shouldn't cause anything to change, unless maybe there is a loose connection there that is momentarily interrupting power to the horn relay and allowing it to release (assuming the relay getting stuck sometimes is what's causing the horn to sound when it shouldn't). |
04-27-2021, 08:54 PM | #3 |
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Join Date: Mar 2009
Location: Vancouver, WA
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Re: 72 battery cable connection
Thanks. I went back and looked at the steering column connection and I had wired it wrong. I am adding some extras to a stock fuse box so I ordered a 4Way 12V/24V Auto Car Power Distribution Blade Fuse Holder Box Block Panel Board. I am adding power windows and keyless entry. I am also adding an Intellitronic gauge instrument panel so am doing those wiring changes. I am learning as I go along which I do not like but have to do.
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Vancouver Bob |
04-30-2021, 07:28 PM | #4 | |
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Re: 72 battery cable connection
Quote:
Anyone know what the identical rubber inline fuse on the drivers side is?
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04-30-2021, 07:32 PM | #5 |
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Re: 72 battery cable connection
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05-01-2021, 02:22 PM | #6 | ||
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Join Date: May 2013
Location: Post Falls, ID
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Re: 72 battery cable connection
Quote:
Quote:
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05-03-2021, 01:05 PM | #7 |
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Join Date: Jan 2007
Location: Puyallup, WA
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Re: 72 battery cable connection
Wiring looks correct. I can't tell from the pics, is there a fusible link connected to the power wire that connects to the junction block? If not, you need one. Also, the smaller negative battery cable is supposed to connect to the core support to provide a ground there as well.
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72 C10 lwb fleetside -stock 350/350 combo |
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