Hmmm, This may or may not be some help...apologies for it's length It sounds like your binnacle ground wire (assuming it is ground) is getting voltage via a diode where it shouldn't be (hence the 0.5 - 0.7v) However if this ground wire were actually connected to the battery/chassis, then you would have +12v going from the battery via the diode to ground, which would cause the erroneous diode to frizzle rather quickly. This leads me to believe that your binnacle ground wire might not actually be connected to ground at all. This explains why you get 0.7v reading between chassis ground and said wire. If it were actually connected to the battery/chassis, it should be impossible to get a voltage reading. Removing fuse 12 is killing power to a part of the system which is feeding power via this diode, and turning on the ignition restores it again. Fuse 12 is used solely to power the interior lights (glove box, courtesy) and door lights, on the diagram, 41 (driver door switch) is actually at two locations, the common wire PW between them is connected to, guess what, the interior lighting circuit, position one on the ignition switch and the buzzer box. I suspect the diodes on the interior lighting circuit are the source of the stray voltage, but unlikely the root of the problem. I can't tell where the binnacle ground is on the cct diagram since it's just marked as several ground symbols. Your next bet is to trace this 'ground wire' to find out: a) whether it is a ground wire and b) if it's actually connected. This may also be causing strange effects on your other lights since this 'floating' ground could well be finding other paths through your lights etc. Rich H -----Original Message----- From: jchapelhow [mailto:chapelhow@xxxx] Sent: 21 September 2003 8:07 PM To: doc-uk@xxxxxxxxxxxxxxx Subject: [doc] Re : Wiring Harness All. Further tests/symptoms now as follows. 1. I have discvoered that my battery cutoff switch doesn't! With the switch attached to the +ve terminal and in the off postion (key removed) there is still 0.5v measured against the -ve terminal. Just to make sure I pulled all of the relays except the main/accessory/RPM. Fan fail and all others disconnected. 2. As stated before the binnacle has been removed. To this pile of removed bits I have added the panel that holds the indicator relay/windscreen wiper control/buzzer logic box. The plastic relay holder for the indicator relay had snapped where the screw holds it down. 3. The large black cable which attaches to the panel described above appears on the wiring daigram to be a ground point, this makes some sense to me. If not the following 'problem' may be irrelevant! With either engine block or the front wheel ground point as the reference point for my voltmeter, I get continuity signal to this black wire only if the battery is disconnected, when the battery is connected continuity is lost and a voltage difference of ~0.5v is detected. I found that if I removed fuse 12 (courtesies/door lights) continuity was restored until the ignition swtich was turnedto P1 when continuity is lost again. Voltage was detectable ranging upto 0.7v. 4. As a second test the now freely dangling indicator relay unit was measured, the black ground point shows the same symptoms as above. 5. The LHS steering stalk control wires were disconnected. Now the main light swtich still worked but only alllowed side lights to be turned on, main beam was not selectable. As stated previously in all modes the 'door lock' / Aircon illumination lights 'flash' with the indicators. I am assuming that if these are still misbehaving if I were to reinstall the binnalce the gauges would also still fluctuate. Suggestions? John Chapelhow DOC 19 : 'Boeing' 0737 DOC UK Website: www.delorean.co.uk Unsubscribe: doc-uk-unsubscribe@xxxxxxxxxxxxxxx ** Unless otherwise stated, all messages posted to the group are assumed public and may be printed in the club magazine ** Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/