Where is Ground Connection"B" ? |
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Where is Ground Connection"B" ? |
kenshapiro2002 |
Sep 23 2009, 12:21 PM
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#1
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Senior Member Group: Members Posts: 1,443 Joined: 23-July 09 From: Bawlmer, MD Member No.: 10,598 Region Association: MidAtlantic Region |
Where is the ground numbered #83 (Ground connection "B") on a 1970 914? It's not the one in the rear trunk, and not the one by each headlight. It's the one that grounds all the dash switches, door switches, fan and heater switch, etc.
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Spoke |
Sep 24 2009, 06:10 AM
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#2
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Jerry Group: Members Posts: 7,052 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
Some other tests to try:
On the flasher relay, remove ground pin 31. Measure resistance (ohms) from the brown wire to a nice clean chassis point. This should be 0 ohms or close to it. On the flasher relay, remove wire from pin 49a. With power off, 4-ways off, turn signals off, parking brake off, measure resistance (ohms) from the wire to ground. This should be infinite ohms (very high resistance; like when the 2 voltmeter probes are not touching anything). On the flasher relay, remove wire from pin 49. With voltmeter on VOLTS, measure voltage from the wire to chassis ground with lights on, 4-ways on, other electric loads. This voltage should be steady and not jumping around. A side note: When doing electrical testing and you remove wires, lamps, etc., do not let the fixture touch metal. The last thing you want is an unintended short circuit and blown fuse or melted wire. If you must remove and keep things off, wrap them with tape-any kind of tape. Also, if you remove more than 1 wire, mark the wires and where they go. It is so easy to mis-connect wires when putting things together. |
kenshapiro2002 |
Sep 24 2009, 07:17 AM
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#3
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Senior Member Group: Members Posts: 1,443 Joined: 23-July 09 From: Bawlmer, MD Member No.: 10,598 Region Association: MidAtlantic Region |
OK...here's where I need to get stupid (tongue-in-cheek) again...the flasher relay, I'm assuming, is the rectangular box that's chattering away, and is sitting inside my dash just outboard of the headlight switch? I must be wrong here because this box is just a plug in with no obvious wires attached.
Some other tests to try: On the flasher relay, remove ground pin 31. Measure resistance (ohms) from the brown wire to a nice clean chassis point. This should be 0 ohms or close to it. On the flasher relay, remove wire from pin 49a. With power off, 4-ways off, turn signals off, parking brake off, measure resistance (ohms) from the wire to ground. This should be infinite ohms (very high resistance; like when the 2 voltmeter probes are not touching anything). On the flasher relay, remove wire from pin 49. With voltmeter on VOLTS, measure voltage from the wire to chassis ground with lights on, 4-ways on, other electric loads. This voltage should be steady and not jumping around. A side note: When doing electrical testing and you remove wires, lamps, etc., do not let the fixture touch metal. The last thing you want is an unintended short circuit and blown fuse or melted wire. If you must remove and keep things off, wrap them with tape-any kind of tape. Also, if you remove more than 1 wire, mark the wires and where they go. It is so easy to mis-connect wires when putting things together. |
Spoke |
Sep 24 2009, 09:26 AM
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#4
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Jerry Group: Members Posts: 7,052 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
OK...here's where I need to get stupid (tongue-in-cheek) again...the flasher relay, I'm assuming, is the rectangular box that's chattering away, and is sitting inside my dash just outboard of the headlight switch? I must be wrong here because this box is just a plug in with no obvious wires attached. I usually get stupid on the weekends... (IMG:style_emoticons/default/beer3.gif) (IMG:style_emoticons/default/beerchug.gif) (IMG:style_emoticons/default/beer.gif) I'm not quite sure what the flasher relay looks like. Are you saying chattering box has a connector with a plug? How many wires are on the plug and do the wire colors match the wire colors in the schematic? |
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