Rugged Rocks 180A and 270A Alternator Electrical Issues - Page 3 - Second Generation Nissan Xterra Forums (2005+)
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post #21 of 86 (permalink) Old 04-06-2018, 12:31 AM Thread Starter
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Originally Posted by nworker View Post
I installed the alternator and, after talking with Steven at RR, made my harness match the configuration sent to @LNXPenguin. Steven told me the blue, sense, wire monitors system voltage. After talking through the wiring we thought hooking the blue wire directly to the output post of the alternator is the same as running the sense wire to the positive terminal a few feet away.

I'll be doing a write up on the install. The biggest PIA was getting the bolts in holding the alternator to the engine. I found I had to loosen both bolts on the lower bracket to get the upper bolt to line up. After some cussin' and wigglin' it all went in as expected. Kind of like my first date...

My Bully Dog tuner shows 14.6 as does my Victron controller when I combine my house and car circuits. All looks good and I didn't let out any smoke although I did hit my socket drive on the negative terminal when I was removing the positive post. DOH!
Gotta love that description. Did you weld your ratchet to the posts? I am assuming your 14.6 held stable?

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post #22 of 86 (permalink) Old 04-06-2018, 11:01 AM
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Gotta love that description. Did you weld your ratchet to the posts? I am assuming your 14.6 held stable?
@LNXPenguin the ratchet did not get welded. Thank goodness and all that is wonderful.

Yes the 14.6 held steady. I must note the Bully Dog tuner takes some time to boot to the monitoring screen so if there was a spike in the first 30 seconds, it would not register.

Hank
N6HWW

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post #23 of 86 (permalink) Old 04-06-2018, 12:28 PM Thread Starter
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Good to know, I will try the new cable on my rig and hope that it fixes the issue.

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post #24 of 86 (permalink) Old 04-06-2018, 12:45 PM
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@LNXPenguin the ratchet did not get welded. Thank goodness and all that is wonderful.

Yes the 14.6 held steady. I must note the Bully Dog tuner takes some time to boot to the monitoring screen so if there was a spike in the first 30 seconds, it would not register.
Well that's good to hear. A couple questions.

Did you install with the harness in its original configuration first or did you go straight to modifying it to latest configuration of the harness?

At the 14.6v, is this after the engine has warmed and what's the RPM? Does the voltage get to 14.7v and above at idle or while driving? What voltage are you seeing when starting from a cold engine?

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post #25 of 86 (permalink) Old 04-06-2018, 01:56 PM
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Did you install with the harness in its original configuration first or did you go straight to modifying it to latest configuration of the harness?
I installed in the updated configuration.




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At the 14.6v, is this after the engine has warmed and what's the RPM? Does the voltage get to 14.7v and above at idle or while driving? What voltage are you seeing when starting from a cold engine?
Here are pictures of the bully dog. Note running times.

Cold, in park taken immediately after starting. The idle timer starts at one minute IIRC...



Warm, in park



Warm, in gear



Warm, in gear



FWIW, I wouldn't go through the pain of upsizing the ground. Upsizing the positive makes sense to me as one has to add the bigger fuse (300A) to handle the increased alternator outpu. The fuse block only has a 140A fuse that is too small for the either of the new alternators.

Hank
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post #26 of 86 (permalink) Old 04-06-2018, 02:39 PM
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@nworker
Thanks for the info and pics. Definitely like your starting voltage of 14.8v compared to what @LNXPenguin and I are getting. Seeing 14.5v at 625 RPM is good to see too.

I was asking about your wire configuration because I didn't know if you initially had the fluctuation issue and the new configuration fixed it.

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post #27 of 86 (permalink) Old 04-06-2018, 02:58 PM Thread Starter
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@nworker Thanks for the pics and details. I am glad everything worked out on the install. That 15.2v on startup always spooks me, even though the Odyssey charger does the same thing. Can't wait for the rain to subside here and I can install that new pigtail. I want to banish this electrical gremlin back to the netherworld from where it came.

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post #28 of 86 (permalink) Old 04-06-2018, 02:58 PM Thread Starter
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@nworker Thanks for the pics and details. I am glad everything worked out on the install. That 15.2v I see on startup always spooks me, even though the Odyssey charger does the same thing. Can't wait for the rain to subside here and I can install that new pigtail. I want to banish this electrical gremlin back to the netherworld from where it came.

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post #29 of 86 (permalink) Old 04-06-2018, 06:18 PM
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So correct me if I'm wrong, but I will just go through the steps here.

I can cut the blue wire from my pigtail and connect it to the nut as shown using a ring terminal, then plug in the connector with the remaining + wire to the factory harness.

The cable that sends power to the factory fuse block (and then the battery) also goes on the same post as the aforementioned blue wire, however, we are no longer using this wire and it gets tucked away. Instead I should use a 1 gauge wire + inline 200A fuse (I have the 180 amp alt.) direct to the battery, or at least the connection closest to the terminal on the factory fuse block (bypassing the 140A factory fuse).

Do I have an understanding of everything?


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post #30 of 86 (permalink) Old 04-06-2018, 07:32 PM
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So correct me if I'm wrong, but I will just go through the steps here.

I can cut the blue wire from my pigtail and connect it to the nut as shown using a ring terminal, then plug in the connector with the remaining + wire to the factory harness.
We'll find out this weekend whether that's the fix. In @nworker's case, since he installed it with the new configuration the first time, we can't know if there was a fluctuation issue with his to begin with and whether the new configuration fixed it.

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