Charging help

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greg_a_morton
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Isuzu vehicle(s): 1982 Isuzu pup diesel 5 speed

Charging help

Postby greg_a_morton » Sat May 27, 2017 10:04 am

guys I added a new alternator and my light when off last night. I did not get out volt meter because I assumed all was well. I went out this morning and started it and light is back on. Got my volt meter out and it's broke! Going go buy new one today but is there something I need to be looking for spacificly? I hate wiring issues. Is it internally regulated or do I need to be looking for that as main issue? When I plugged in my charger it showed charging failure. Thanks ahead of time.

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puttputtinpup
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Re: Charging help

Postby puttputtinpup » Sat May 27, 2017 1:03 pm

Until someone else chimes in, Tap lightly on the little blue charge relay on the inner fender with a screwdriver handle and see if the light goes out. It senses charge from the alt then clicks on to allow juice to the rest of the system.
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greg_a_morton
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Posts: 35
Joined: Wed May 10, 2017 7:21 pm
Location: Texas
Isuzu vehicle(s): 1982 Isuzu pup diesel 5 speed

Re: Charging help

Postby greg_a_morton » Sat May 27, 2017 7:46 pm

If I hold down tight on this thing it charges other wise no charge. Do I need to buy a new one? Is it called a relay?

greg_a_morton
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Isuzu vehicle(s): 1982 Isuzu pup diesel 5 speed

Re: Charging help

Postby greg_a_morton » Sat May 27, 2017 7:48 pm

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puttputtinpup
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Re: Charging help

Postby puttputtinpup » Sun May 28, 2017 6:49 am

Which thing The Green square? Looks like it may have been replaced at one time. Usually blue. If you're close to a junk yard, I'll give you a list of vehicles that use the same relay. Info captured from Rockauto.com
Currently P'up-less, but keeping my eyes open for a good deal
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puttputtinpup
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Re: Charging help

Postby puttputtinpup » Sun May 28, 2017 6:54 am

Rock Auto's site lists these other vehicles that have the RY55 charge relay. Suggestion: Go to Pull A Part and snatch up a few of these off any of these vehicles.
ACURA SLX (1996 - 1999)
CHEVROLET SPECTRUM (1985 - 1988)
GEO SPECTRUM 1989
ISUZU AMIGO (1989 - 1994)
ISUZU I-MARK (1981 - 1989)
ISUZU IMPULSE (1983 - 1992)
ISUZU PICKUP (1981 - 1995)
ISUZU RODEO (1991 - 1995)
ISUZU STYLUS (1991 - 1993)
ISUZU TROOPER (1984 - 2002)
NISSAN 200SX (1981 - 1983)
NISSAN 280ZX (1980 - 1983)
NISSAN MAXIMA (1982 - 1988)
NISSAN PULSAR 1983
NISSAN PULSAR NX (1983 - 1986)
NISSAN STANZA (1984 - 1986)
Seer7 wrote:
Make sure your fusible link is good if this comes back, that is what the battery is charged through. There are at least 2 of them and you can swap them to troubleshoot I think. The link works like a current limiter/slow blow fuse.

The best way I have found to see if your alternator is working is to put a volt meter (VOM, Volt, Ohm, Meter) with the positive lead on the positive terminal of the battery and then just ground the negative lead to the frame or block or any good ground. You should be reading around 14 volts, mine puts out 14.2 which is pretty good for these at idle. If you don't have one they are cheap at Radio Shack or many other places. If you read only around 12V that is just battery voltage and the alternator is not working. I found out something interesting while looking into this today. If you take the charge relay out it has no affect on the operation of the alternator just the light. It's actually a charge "warning" relay and it only turns on the light when the alternator is not putting out proper voltage. I pulled mine out and my truck still put out 14.2V like always. If anyone is interested the schematic doesn't show the relay properly it's actually a 2 position switch not a single like it shows in my series 11 shop manual.
Pos. 1-charge light
2-charge light ground
3-15A fuse "IGN" ON
4-Alternator connection #4
5-Charge relay coil (pull) ground
Currently P'up-less, but keeping my eyes open for a good deal
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puttputtinpup
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Re: Charging help

Postby puttputtinpup » Sun May 28, 2017 6:56 am

Read through this too. viewtopic.php?f=1&t=23913&start=15
Currently P'up-less, but keeping my eyes open for a good deal
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greg_a_morton
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Posts: 35
Joined: Wed May 10, 2017 7:21 pm
Location: Texas
Isuzu vehicle(s): 1982 Isuzu pup diesel 5 speed

Re: Charging help

Postby greg_a_morton » Sun May 28, 2017 2:35 pm

Thanks for any help.im lost on this stuff. The rf55 relay are on eBay but are they all the same? No Isuzu stuff in yards around me I've seen so far. My old fords are simple compared to this thing and people tell me these are simple. Just not use to newer stuff I guess!

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puttputtinpup
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Re: Charging help

Postby puttputtinpup » Sun May 28, 2017 7:45 pm

Check with advance auto or another parts store and see what you can come up with. RY55
Currently P'up-less, but keeping my eyes open for a good deal
Click this link for misc. diesel technical bulletins & other info

greg_a_morton
Regular Member
Posts: 35
Joined: Wed May 10, 2017 7:21 pm
Location: Texas
Isuzu vehicle(s): 1982 Isuzu pup diesel 5 speed

Re: Charging help

Postby greg_a_morton » Mon May 29, 2017 5:29 pm

Well I added a new ry55 and it charges at 14.70-75 or so. Now it also blows out the second fuse in fuse box from the front. If I put old one back in it does not blow fuse and my dash gauges work. Hate electronics!

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puttputtinpup
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Re: Charging help

Postby puttputtinpup » Mon May 29, 2017 6:54 pm

Hm...That seems a bit too high a voltage. So is the old charge relay working now? Someone like Paul may know how to proceed from here....If he's listening.
Currently P'up-less, but keeping my eyes open for a good deal
Click this link for misc. diesel technical bulletins & other info


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