Bert,
Don't know for sure what/where/how you bought what you did, but according
to the net it is a glow plug relay.
http://www.ebay.com/itm/Diesel-Glow-Plug-Relay-BOSCH-0-332-002-156-/170647516431
example schematic here.
http://www.fordmuscle.com/archives/2003/02/electricfan/index.php
This might not be what you want.
You might want to take a look at this and use something similar from a
real vw?
http://www.thesamba.com/vw/forum/viewtopic.php?t=297050
Cheers, dave
On Fri, 15 Mar 2013, Bert Knupp wrote:
Dave (and all),
The new Bosch Batterietrennrelais is Nr. 0 332 002 156. It has a schematic
printed on top -- but that doesn't tell me exactly what I need.
Bert
-Original Message-
From: vintagvw@googlegroups.com [mailto:vintagvw@googlegroups.com] On Behalf
Of Dave C. Bolen
Sent: Friday, March 15, 2013 10:34 AM
To: Vintage VW Air-Cooled Discussion Group
Subject: Re: [vintagvw] Battery isolation relay
Bert,
Part number for the new Bosch part please?
Also, Let's think through your description of how this really works.
From you explanation of the original relay wiring that has only 4 terminals,
I am not sure that it works the way you think it does.
On the original:
51 is the feed providing charging power to either of the two batteries(or
could it only be both at the same time!)
61 is ground when the generator is off(I am pretty sure)
and provides a small positive comparison voltage
when the car is charging(red light on or off comparison
to the battery charging state).
I am going to guess that when the charging system was off that you could
pull the equipment battery all the way down and it would charge up after you
restarted...andthat was about it.
On the other hand...I have never owned one ofthese of a bus with the dual
battery and don't know how it worked in a late model bus. My bet is that
both batteries got the same charging current after the engine was started,
but the equipment battery would give it's all and then that would be that
till you restarted the car.
Do you have a type2 manual with the same relay described in it? Seems kinda
weird that VW(or Bosch) would use different devices to do the same thing for
VW.
Send the part number! Bet I can find a reference diagram.
Cheers, dave
On Fri, 15 Mar 2013, Bert Knupp wrote:
Volks,
I need some help. Various VW models over the years have used
dual-battery systems: campers, sound trucks, fire engines, and police
cars to name a few. The two batteries are connected via an isolation relay
(in German it’s a “Batterie-Trennrelais”).
The idea is to permit both batteries to charge from the generator or
alternator, but to “uncouple” the #2 equipment battery when the voltage
drops below 11 volts, making sure that the #1 or starting battery doesn’t
get pulled down by the equipment.
For example, in the police cars, it allowed the car to sit working an
accident with the blue light, flashers and radio running but the
engine off. If the available voltage dropped below 11 volts, the starting
battery would disconnect so the car could start when done.
So I’m recreating the Copbug’s two-battery system. I’ve mounted the
#2 battery under the left rear seat and found a 75-amp Bosch isolation
relay on-line. The problem: the four terminals on the new Bosch relay
don’t match the four terminals on the VW factory bulletin for police-car
wiring. I’m usually pretty good at logicking-through circuits, but I’m
stumped here.
The factory bulletin shows an isolation relay with four terminals:
51, 61, 86 and 87.
61 comes from the 61 terminal on the voltage regulator. Skinny wire.
51 comes from the B+ terminal on the voltage regulator. Fat wire.
86 goes out to the #1 (starting) battery (+). Fat wire.
87 goes out to the #2 (equipment) battery (+). Fat wire.
The new isolation relay comes with four terminals also: 85-, 86+, 30 and
87.
The 30-to-87 circuit seems to be the switch that opens and closes.
The 85-to-85 circuit seems to be the coil activation.
The 87 and 51 terminals are high-amp screw terminals.
The 85 and 86 terminals are low-amp Faston slip-on tabs.
But I can’t figure what’s what. Can anybody help me? How do I hook up
the new relay to do the job?
I’ve written to Bosch, but I won’t hold my breath. The last time I
asked them for help, the reply came 5 months later – and they said they
didn’t have information on the old equipment. Aargh!
Bert Knupp in Music City USA
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