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Old 09-23-2018, 02:04 PM   #1
texas_snake
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Battery to power distribution voltage drop issue

I have been working out the kinks on my 03 Mach 1 since buying a couple months back. Been chasing a voltage issue many accessories are running (lights and A/C mostly). I noticed over time the positive battery to power distro box is heating up and having voltage drop over time when running with the extra's on. Over time drop can be big (.75 volts or more) so I am checking into cleaning main grounds.

But one thing has stood out. The yellow positive connection is on my positive battery post. Looking at stock mach 1 engine pics, it looks to connect to the power distro block along with a smaller connection off the positive battery cable. So the question is, do I have to have 2 connections on the power distro box (yellow from harness and red from positive battery) and just one going to the positive battery? It is 1 red to power distro box and 2 - yellow and red to the positive battery now.

I have suspected this for a while, but now that I see voltage drop there with heating when loading the system, I really need to know if this matters or not.

I would switch it, but the power distro box threads are messed up and that nut wont come off easily and I don't want to damage the fuse box, but will give it a try to move it if that is required.

Thanks!
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Old 09-23-2018, 08:31 PM   #2
mikeracing
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Re: Battery to power distribution voltage drop issue

Sounds kinda like the diodes went bad in your alternator putting out ac voltage
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Old 09-23-2018, 10:28 PM   #3
texas_snake
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Re: Battery to power distribution voltage drop issue

Yeah, I checked that. It is putting over 14 volts to the positive battery post. Positive and negative voltage drop is normal from the Alt. Also the negative voltage drop is the same on the Alt to negative battery post as it is to the block to negative battery post, so Alt is grounded well.

It seems to be in the hop from the positive battery post to the dist box (large voltage drop and heating wire) and I suspect that yellow tipped connection should be on the power distribution block and not the positive battery post.

Can anyone confirm that theirs has the yellow tip going to the power dist block?

Further, does anyone know what that yellow tipped connection is?

Thanks.
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Old 09-24-2018, 02:30 PM   #4
texas_snake
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Re: Battery to power distribution voltage drop issue

Can someone take a picture of the positive battery post and power distribution block connections. And a second with the cover lifted on the power dist block showing those connections. I really need to see how this is wired. I think mine has been wrong since I got the car.

Thanks.
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Old 09-24-2018, 03:03 PM   #5
HAEG
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Re: Battery to power distribution voltage drop issue

Just sent you a message. Be glad to help if I can.
Scott
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Old 09-24-2018, 06:31 PM   #6
texas_snake
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Re: Battery to power distribution voltage drop issue

OK. Scott helped me out today with some pics and it is clear the yellow tip wire should be on the power dist box (fuse box) and mine is on the positive battery post. So 2 connections on power dist box and just one going to the battery (with a jumper to the power dist box).

Need to move it and see how things work. But that nut is cranked on there and the box is a bit fragile. Will do my best to make this work.

Will report back later on if this addressed my power issue when under heavy load (voltage drop at the fuse box). I truly think it will.
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