Replaced 7V regulator - No Joy


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Replaced 7V regulator - No Joy

Postby Monsignore » Sun Oct 02, 2016 8:28 pm



I replaced the 7 volt regulator on my '83 Interstate with the one sold on this site. Well, the temp & fuel gauges are still dead. What did I miss, or what's my next step?



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Re: Replaced 7V regulator - No Joy

Postby WingAdmin » Sun Oct 02, 2016 10:39 pm

Monsignore wrote:I replaced the 7 volt regulator on my '83 Interstate with the one sold on this site. Well, the temp & fuel gauges are still dead. What did I miss, or what's my next step?


Measure voltage between the ring terminal (the one connected to the black wire on the new regulator) and ground with the bike on. Make sure you are seeing 7 volts there. If not, disconnect that ring terminal and make sure you are seeing 7 volts coming from the regulator - and also make sure you are seeing 12 volts between the red and green wires on the regulator.

If you're seeing 7 volts at the ring terminal, then look at the other two terminals - one has a green/blue wire, the other has a yellow/white wire. Use a piece of wire to connect each of those to ground in turn, and see if the gauges move (it might take several seconds).

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Re: Replaced 7V regulator - No Joy

Postby Monsignore » Tue Oct 04, 2016 11:03 am

OK.
Multi-meter on 2V DC setting.

Ring terminal from regulator attached to gauge, red meter lead attached to terminal, black lead to frame: meter read .028 with ignition on.
Ring terminal detached from gauges, same lead configuration and ignition on: meter read .228.
Then, attached red meter lead to green wire from bike (regulator disconnected), black lead to black/tan wire: meter read .22.
Reconnected regulator, red lead to yellow terminal & black lead to green terminal: meter read 0.00.
Red lead to yellow terminal & black lead to frame: meter read .02 with ignition off & .04 with ignition on. Same results with red lead to green terminal.

My limited electrical knowledge has me guessing that power is not getting to the regulator, either due to an accidental ground between battery & regulator, or broken wire/connection. Is this correct?

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Re: Replaced 7V regulator - No Joy

Postby Monsignore » Thu Oct 06, 2016 6:19 pm

So, it fixed itself.

The weather turned nice this week, so I drove the hack to work yesterday & today. On the way in this morning, I suddenly noticed the temp & fuel gauges reading correctly. And when I parked it, Neutral & Oil lights worked.
Last night, I noticed the left turn signals not working, though the dash light blinked. I had futzed with the left rear turn signal bulb (the only non-LED) the other day, so I thought busted the filament or something. This morning, I replaced it with a known working bulb. Well, the turn signals would blink, but the left front marker light wouldn't light up, and when I would put on the left signal, the right marker light would go out while the left signal blinked. I replaced the left rear with the original bulb, which worked, to the same effect.

It'd be nice if everything worked correctly at the same time on this thing... :?:

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Re: Replaced 7V regulator - No Joy

Postby Maz » Fri Oct 07, 2016 2:29 am

Monsignore wrote:So, it fixed itself.

The weather turned nice this week, so I drove the hack to work yesterday & today. On the way in this morning, I suddenly noticed the temp & fuel gauges reading correctly. And when I parked it, Neutral & Oil lights worked.
Last night, I noticed the left turn signals not working, though the dash light blinked. I had futzed with the left rear turn signal bulb (the only non-LED) the other day, so I thought busted the filament or something. This morning, I replaced it with a known working bulb. Well, the turn signals would blink, but the left front marker light wouldn't light up, and when I would put on the left signal, the right marker light would go out while the left signal blinked. I replaced the left rear with the original bulb, which worked, to the same effect.

It'd be nice if everything worked correctly at the same time on this thing... :?:


I'm guessing you have 1 or more bad grounds somewhere. It may be wise to go through every ground you can find, cleaning and tightening as you go.

Maz
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Re: Replaced 7V regulator - No Joy

Postby WingAdmin » Fri Oct 07, 2016 3:24 pm

It could be a bad ground, but it could also be a dirty connector or wire break - somewhere.

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Re: Replaced 7V regulator - No Joy

Postby Monsignore » Fri Oct 07, 2016 3:49 pm

It's that "somewhere" that has me cringing, WingAdmin.

The wiring diagram in my Clymer manual shows possibly 7 grounding locations. I know the one below the left-side engine jugs. Are the others easy to access?

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Re: Replaced 7V regulator - No Joy

Postby WingAdmin » Fri Oct 07, 2016 4:01 pm

Monsignore wrote:It's that "somewhere" that has me cringing, WingAdmin.

The wiring diagram in my Clymer manual shows possibly 7 grounding locations. I know the one below the left-side engine jugs. Are the others easy to access?


Well first find out if it is a bad ground or not.

Test between +12 volts (positive terminal on the battery is good) and the green wire on the bike (green is always ground). If you show +12V, then you know the ground is good.

Then test between the wire that connects to the red wire on the 7 volt regulator and a known good ground (frame, or negative terminal on battery). If you show +12V then you know the 12 volt feed is good.

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Re: Replaced 7V regulator - No Joy

Postby Monsignore » Mon Oct 10, 2016 4:53 pm

WingAdmin wrote:Test between +12 volts (positive terminal on the battery is good) and the green wire on the bike (green is always ground). If you show +12V, then you know the ground is good.

I did that and got just over 12V on the mulitmeter (set to 20V)

WingAdmin wrote:Then test between the wire that connects to the red wire on the 7 volt regulator and a known good ground (frame, or negative terminal on battery). If you show +12V then you know the 12 volt feed is good.

I did that, using negative battery terminal, and got about 11.75 on the multimeter.

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Re: Replaced 7V regulator - No Joy

Postby WingAdmin » Mon Oct 10, 2016 9:57 pm

So that shows you have both good +12V and ground at the regulator. And you're not seeing 7 volts between the black regulator wire and the green regulator wire?

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Re: Replaced 7V regulator - No Joy

Postby Monsignore » Thu Oct 13, 2016 10:08 am

WingAdmin wrote:So that shows you have both good +12V and ground at the regulator. And you're not seeing 7 volts between the black regulator wire and the green regulator wire?



Well, now I am. :roll:

Before checking voltage at the regulator, I replaced the left rear turn signal bulb with an LED, the last one on the bike. When I had done the various checks in my previous post, the turn & brake lights were all LEDs except that one, if that makes any sort of difference.

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Re: Replaced 7V regulator - No Joy

Postby WingAdmin » Thu Oct 13, 2016 9:17 pm

It should make zero difference.

If you're seeing 7 volts on the black wire on the regulator, but still nothing on the gauges, even when their sensors are grounded, then there's got to be something wrong with the gauges. Sometimes when the 7 volt regulator fails open, and feeds 12 volts into the gauges, the fine coils inside the gauges can burn out.

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Re: Replaced 7V regulator - No Joy

Postby Monsignore » Thu Oct 13, 2016 9:47 pm

I think our posts got confused. Sorry if my posts seem contradictory.

I suddenly had the gauges working during a ride. If you look back to my post from the 6th, the fuel & temp gauges suddenly started working, then the turn signals got wonky. After your (WingAdmin) suggestions, everything seems to be testing OK with the multi-meter.

I think my big question now is: Where are the various grounding points located, and are they easy to get to?




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