Re: 88 505 Turbo-Diodes in A/C and/or aux cooling fan circuit-help

Bob Bartch (bbartch@jps.net)
Mon, 17 May 1999 20:38:58 -0700

I don't have the schematic handy, but I can vouch for the fact that the 2
diodes have a common connection which will either be both cathodes or both
anodes, I forget which. Just be sure that when you sub the defective one,
the side making connection with the good diode is the same, i.e. cathode to
cathode or vice versa. It prevents the low temp sender (turns the fan on)
from "backing" thru the relay and ALSO turning on the AC compressor when
you're not using AC.
Bob Bartch 86 505TD

checker767 wrote:

> On my '88 505 Turbo, there is a box between the left headlight and the
> w/w reservoir which contains two relays which I believe are related to
> the auxiliary cooling fan circuit. In this box are 2 diodes soldered
> in-line to spade connectors. One of these diodes is completely
> destroyed, and the green and red wires which end up at the same contact
> in one of the relays have been heated to the point that the insulation
> is melted. These appear to be diodes "B" and "C" mentioned in the 88/89
> 505 Electrical Manual. I probably have an appropriate diode in my junk
> box and I'd like to replace the burnt-out one. What I'd like to know is
> this: One diode is still intact; should the cathode of the other diode
> be aligned the same way or the opposite way? I can't find diode "C" in
> the diagram. Before I replace the diode, I need to determine the cause
> for the high current which blew the diode and melted the wiring in the
> first place. Any help would be much appreciated, thanks.
> -George
>
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