Harness quirks

[weq92f]

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PO installed EZ Harness, the bigger one, 21 circuits I think. I've had to do some rewiring lately due to a mishap and have learned a few things about the harness that just don't make sense. See attached diagram.

The ALT PWR and SOLENOID PWR are harness wires. Alt pwr was originally connected to the ALT POST as were a few other power leads but I added the bus bar and have consolidated everything there.

According to EZ support, SOLENOID PWR powers the panel, but they were vague about ALT PWR other than it is always connected to SOLENOID PWR inside either the fuse box or the harness somewhere. I know that under all conditions, ALT PWR and SOLENOID PWR have continuity and that ALT PWR is hot when SOLENOID PWR is hot ( all the time ).

I was considering moving SOLENOID PWR to the bus bar ( hot all the time ) and eliminating BYPASS. EZ instructs to use BYPASS only with high amp alternators, it was meant as a supplement to the 10 AWG ALT PWR so there'd be 2 cables feeding into the panel instead of just 1. That's what the instruction manual seems to indicate.

Am I missing something? You guys see anything wrong with doing away with bypass and moving solenoid pwr? See anything else here that is funky?

Thanks,

-klb

[kwmech]

Don't think it really matters--it is all 12v power. Is that the starter solenoid? if so, I'd eliminate the 12v there and just have a jumper wire and wire the starter with a ford style up on the fender. You'll have fewer wires to cook next to the manifold

[weq92f]

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Yes it's the starter solenoid.

I've put it back the way I found it. But in future I'll go back and eliminate BYPASS and move SOL PWR to the bus bar. No, probably not.

-klb

[VetteVet]

This is similar to the 74 and later harnesses where the positive battery cable runs to the starter solenoid and the alternator output wire and the power panel wires both share the same connection.
The main difference is that there is no separate 4 gauge cable from the battery to the buss bar. the bypass wire does the same thing as this cable. Its just a smaller gauge. There is also a fusible link in both the dashed lines, which you should use for protection. Of course if you use the double battery feed you are bypassing the dashed line and it wouldn't be fused.

The third solenoid wire which is labeled 12vIon no conn. must be the starter solenoid purple wire.

KWMECH is correct since you have a big block and especially if you are running headers using the Ford solenoid would allow you to run the power wires from the solenoid to the buss bar away from the exhausts.

[weq92f]

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Originally Posted by VetteVet

This is similar to the 74 and later harnesses where the positive battery cable runs to the starter solenoid and the alternator output wire and the power panel wires both share the same connection.
The main difference is that there is no separate 4 gauge cable from the battery to the buss bar. the bypass wire does the same thing as this cable. Its just a smaller gauge. There is also a fusible link in both the dashed lines, which you should use for protection. Of course if you use the double battery feed you are bypassing the dashed line and it wouldn't be fused.

The third solenoid wire which is labeled 12vIon no conn. must be the starter solenoid purple wire.

KWMECH is correct since you have a big block and especially if you are running headers using the Ford solenoid would allow you to run the power wires from the solenoid to the buss bar away from the exhausts.

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Thank you Sir.

Please help me understand what you mean by double battery feed and how that results in an unfused circuit. I do not want any red hot wires!

-klb

[kwmech]

What he means is there are 2 sources that can feed the buss bar coming from the battery so if the one that is fused pops, then the other will feed the bar resulting in the fuse being worthless. Battery to bar. All other feeds off the bar with either a fuse or fusible link. The factory power bars are rated to 225A (I believe)


#2 ga to the starter post only.
#6 (min). or #4 to the buss

What size alt are you going to run on this

[kwmech]

something like this

[weq92f]

Originally Posted by kwmech

What he means is there are 2 sources that can feed the buss bar coming from the battery so if the one that is fused pops, then the other will feed the bar resulting in the fuse being worthless. Battery to bar. All other feeds off the bar with either a fuse or fusible link. The factory power bars are rated to 225A (I believe)


#2 ga to the starter post only.
#6 (min). or #4 to the buss

What size alt are you going to run on this

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Thank you. The alt in use is a 105A single wire.

I installed the fusible links before I really understood what the BYPASS cable was responsible for. Didn't even know it was BYPASS at the time, just wanted to place the FL there as a safety precaution.

-klb