Toyota Coaster regulator

Submitted: Thursday, Apr 17, 2008 at 13:28
ThreadID: 56722 Views:7623 Replies:8 FollowUps:9
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Hi, we have converted a 1982 Toyota Coaster to a motorhome and use it with much pleasure. Recently we noted 12v globes failing and after a check I found that the alternator charges with about 14.8 - 15.4 volts, way too high. It seems that we have a non-IC regulated alternator and according to the 3B engine book there is supposed to be an external regulator somewhere. I have no clue where it could be and hope someone on here knows. Help!
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Reply By: Top End Explorer Tours - Thursday, Apr 17, 2008 at 13:36

Thursday, Apr 17, 2008 at 13:36
Aren't Coasters a 24v system, all the ones I have driven are.

Cheers Steve.
AnswerID: 299004

Follow Up By: Peter 2 - Thursday, Apr 17, 2008 at 13:51

Thursday, Apr 17, 2008 at 13:51
the early ones were 12volt.
Peter
1996 Oka Motorhome

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Follow Up By: Top End Explorer Tours - Thursday, Apr 17, 2008 at 13:54

Thursday, Apr 17, 2008 at 13:54
OK

Cheers Steve.
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Reply By: Mainey (wa) - Thursday, Apr 17, 2008 at 13:38

Thursday, Apr 17, 2008 at 13:38
have a look up near where the steering colum enters the front firewall area.

Mainey . . .
AnswerID: 299005

Follow Up By: asm00119 - Monday, Apr 21, 2008 at 12:03

Monday, Apr 21, 2008 at 12:03
Thanks for the suggestion, but can't find it there.....
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Reply By: Member -Signman - Thursday, Apr 17, 2008 at 16:30

Thursday, Apr 17, 2008 at 16:30
Here's one out of left field...
Are you running dual rear wheels ??
Is it OK- when a Coaster is converted to a motorhome- to run single rears??



AnswerID: 299035

Follow Up By: Member - kevin Y (SA) - Friday, Apr 18, 2008 at 20:14

Friday, Apr 18, 2008 at 20:14
wouldn't recomend it , but handy when exta spare needed
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Follow Up By: asm00119 - Monday, Apr 21, 2008 at 12:05

Monday, Apr 21, 2008 at 12:05
I'm running dual rear wheels. To be honest most of the weight is up front although we tried to balance the weight by putting tanks, batteries and gas bottle as much to the back as possible. It is very evident though that when tyre pressure is below max. we can feel the coaster floating. We've learned that tyre pressure is very important for these buses.
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Reply By: autosparky - Thursday, Apr 17, 2008 at 20:52

Thursday, Apr 17, 2008 at 20:52
original coaster regs where on passnger side near where glove box should be mounted side on so are difficult to see
AnswerID: 299081

Follow Up By: asm00119 - Tuesday, Apr 22, 2008 at 08:43

Tuesday, Apr 22, 2008 at 08:43
Another search with torch didn't reveal the regulator there either. What it did give me though is behind a well bolted in metal shield some other relais for window wiper as well as the timer for the glow plugs. With an intermittent working glow plug indicator I was happy to find the wire was broken. So that is fixed!
Still no regulator though. I found a picture of a regulator (attached) and can remember seeing a round plug like this under the coaster with nothing plugged in. When there's a gap in the torrential rains here I'll have a look to see if it has just fallen off......
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Follow Up By: asm00119 - Tuesday, Apr 22, 2008 at 09:03

Tuesday, Apr 22, 2008 at 09:03
The picture on the bottom left although this might be from a later model?
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Reply By: autosparky - Tuesday, Apr 22, 2008 at 09:05

Tuesday, Apr 22, 2008 at 09:05
i dont remember them being under the vehicle . it would im sure be inside vehicle, some toyota commercals had them between brake and clutch pedals too. it may also have been relocated to near batteries behind front wheel passenger side? the part number may start with 02800 and last digits 0410 if it has a round green or oval plug. really racking the grey matter to help but in a former life worked on these vehicles. if you find it there should be a battery feed(sometimes yellow or white)
an ignition feed(sometimeswhite with red may hve blue take off for radio suppressor)
a warning light(when probing with test light alt light should glow)
an earth
field wire to alt (normally had a green trace)
a n/s terminal(sometimes had a blue trace)
higher voltage than normal sometimes is a result of a corroded fuse, a battery connection , fuseable link(could be on battery pos,or main pos to starter.) hope there is some help here.
AnswerID: 299790

Follow Up By: autosparky - Tuesday, Apr 22, 2008 at 09:10

Tuesday, Apr 22, 2008 at 09:10
the reg may only have 5 wires (it uses ign wire to sense battery voltage , any volt drop here in ign circuit goes thru a fuse)
had a look at pic your vehicle is 92 reg shown is 99 (realise toyota change anything in any given model imagine what they could achieve in 7 yrs lol
hope this helps
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FollowupID: 565933

Reply By: asm00119 - Tuesday, Apr 22, 2008 at 09:24

Tuesday, Apr 22, 2008 at 09:24
Thanks Sparky, wealth of info. BTW my coaster is 82 so that's 17 years (!) away from the model of the picture. I'll continue the search.......
AnswerID: 299793

Reply By: asm00119 - Wednesday, Apr 23, 2008 at 20:58

Wednesday, Apr 23, 2008 at 20:58
Yes! found it. There is a metal strip along the passenger side, behind the passenger seat which, when removed, revealed the fuel switch, injector relays and.......the voltage regulator.

Opening it up I could see that one of the relays in the regulator is burnt and shows a short. Hope I can still get a replacement for these. The numbers show:

Voltage Regulator
27700-35030
NIPPONDENSO
026000-4120
12V 9B
AnswerID: 300175

Reply By: autosparky - Thursday, Apr 24, 2008 at 21:23

Thursday, Apr 24, 2008 at 21:23
fairly common no .if in doubt and has a 6 pin plug a similar reg from another toyota eg corolla , earlier model l/cruiser can be adapted to fit
AnswerID: 300318

Follow Up By: autosparky - Thursday, Apr 24, 2008 at 21:41

Thursday, Apr 24, 2008 at 21:41
if you can't get the direct copy reg try and get one that has a similar plug configuration . get a toyota model dont try the 2 or 3 pin plug re55 or 56 the conversion can be confusing, dont get any nippon denso regs that fit early model honda types even tho they may look the same (they switch the field circuit to earth and will destroy your wiring ) any problems send me an email
waconsofraptors@iinet.net.au
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