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Old 07-26-2012, 10:44 PM
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electrical junction block?

I'm about to wire my '39 Ford two door sedan. Should I come off the alternator, (3 wire)through a junction block to the solenoid, and from the junction block through the firewall to the fuseblock , or just connect them together and go through the firewall from the solenoid? Maybe it doesn't make any difference. Thanks in advance, Rod

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Old 07-26-2012, 11:12 PM
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Mad Electrical has an article that you may find helpful.
(Warning: It's a long read.)
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Old 07-27-2012, 04:48 AM
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This is how I wired mine
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Old 07-27-2012, 05:27 AM
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Electrically it doesn't matter, as long as the wire sizes are large enough and you have good connections. However, using a junction is very convenient.

Chevy trucks from the early ninties use a junction strip (five posts?) mounted on the firewall above the passenger side valve cover, and it is very easy to find all the power connections. The alternator charge wire runs back to the junction, and a power wire runs up from the solenoid to the junction. Then there are three other posts that are used for the power to the fuse box and to other parts of the engine. Most of the wires have a fusible link on the end where they connect to the junction.

You might want to use a solution that looks more elegant, but an easy to reach junction strip with screw posts has its advantages when troubleshooting, or when you need to add a power connection.

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Old 08-01-2012, 09:54 PM
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Hey guys, thanks for all the good info. I appreciate the wiring diagram and I have a '90s truck junction block on order. Thanks again, Rod
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