grounding issues with 929s

[Matsuda 9]

im begining to think that these cars have really horrid grounding, i know my 626 had issues and that was same year as my 929

the engine grounding is simple to cure.... just have to design a proper grounding kit ($200 for HKS kist is a little excesive, plus i dont think it would cover everything on SOHC engine anyway)

now here is the question

are their any knows earthing issues with the HC (or 929s in general - to keep the thread usefull for everyone) be it under the bonnet or else where?

for the grounding kit under the bonnet what would be the main points to ground?

where are the usal spot wehre wiring having issues? or usual short spots?


now directly towards my car and reason for the thread.... car has been sitting for a week and battery drained (central locking having issues working, and my starwars dash i VERY faint)... im starting to rack my brian

i had electric seats in my car but had to give them up due to damage to the trim but it all has been unpluged at the plugs with no damage to wiring (at least noticible) and just left unpluged

i hate wiring since my 626 where i did FeDOHC conversion and had to rewire whole thing and then to top it off had to wire auto ECU from scratch... so i still wake up in cold sweat from seeing wires in my sleep.

anyway list like this would clear up a lot of the guess work with electrical side of things with these cars for new owners and old alike

any input would be good (ether with my issue direct or just general )

[shevy]

the battery draining was a problem for me as well. I took the car to the local garage and he just disconnected all the possible drains (locks, interior lights etc) which run while the cars off. It worked..and its a slight inconvenience where as any electrical problem runs around $75/hr to diagnose/fix.

[nitros13]

i made up my own earth/ground wiring kit for mine, some 8 gauge wire and a few crimpable connectors and your set, i made sure i ran about 3 to earth the engine, one to the gearbox, two to the body and one from the engine to the body.

ill see if i can take a pic of the setup

[peterj]

My 89 HC started to drain the battery if it sat for more than a few days. I switched off the alarm with the key and the problem went away.

[donbryce]

Sounds like you have a 'parasitic drain', where something is shorting to ground (earth), enough to allow a small current to flow from the faulty source but not enough to trip a fuse (like a corroded bulb for example). The test (if I recall correctly) is to disconnect your battery positive cable and connect a multitester between the cable and the battery post to read amps. With everything off, there should be no significant reading (might be a tiny flow from a radio memory or similar).However, if something is draining your battery enough to notice lights dimmer, slow starter turning, or just dead after sitting, then the cause will show up as a measurable current flow. If this is the case, start pulling fuses until the flow stops. The problem is in the circuit fused by the one that you last removed.

[matt@sky1tech.com]

Sounds like you have a 'parasitic drain', where something is shorting to ground (earth), enough to allow a small current to flow from the faulty source but not enough to trip a fuse (like a corroded bulb for example). The test (if I recall correctly) is to disconnect your battery positive cable and connect a multitester between the cable and the battery post to read amps. With everything off, there should be no significant reading (might be a tiny flow from a radio memory or similar).However, if something is draining your battery enough to notice lights dimmer, slow starter turning, or just dead after sitting, then the cause will show up as a measurable current flow. If this is the case, start pulling fuses until the flow stops. The problem is in the circuit fused by the one that you last removed.[/b]

...Almost 2 years later...


Question.... 1992 Mazda 929 V6 3.0 California. Yes, love it.

I've been trying to narrow down the source of the drain on my ride and followed similar instructions where I placed the bulb between the ground pole and the ground wire and began removing fuses. The bulb shuts off when I pull the A/C fuse. My A/C works awesome. Alternator good as far as I've seen and had tested.

NEW Battery dies in about 6 hours.

I haven't a clue what to check next. Any ideas which what would cause a draw like this? I've left the dome light on overnight several times in the past on every car I've owned and was still able to start the car in the morning.

The only thing that has changed since this started happening was the weather. Getting up to 100 degrees out here.

Thanks for reading.

Barry

[DMiester129]

if you have the solar powered sunroof then it could be faulty. then fans will be running in the hot weather, but the roof won't be charging the battery

[matt@sky1tech.com]

if you have the solar powered sunroof then it could be faulty. then fans will be running in the hot weather, but the roof won't be charging the battery[/b]

Uhhh...don't think I have the solar power...

Thanks,

Barry

[sim_rx3]

grounding kits are a woftam (waste of f@#king time and money)

all you need to do is upgrade the battery cables to bigger versions.

ie

battery positive cable - 50mm or 00gauge from battery terminal to starter motor feed bolt

battery earth cable - same size as positive cable. but the cable runs from battery negative to body earth, then from body earth to the starter motor mounting bolt or factory earth point on the block.


adding any "extra" cable other than what i have sugested is a waste and looks bloody ugly with the "extra" cables running everywhere.

if you have bought a kit and it made a difference its cause the battery positive and negative for the factory system was designed poorly.
plus making the 2 bigger leads is cheaper than a grounding kit...

[sim_rx3]

to find a leak in ya electrical system read this thread. part way down i (sim_rx3) describe how to find a battery leak

http://www.ausrotary.com/viewtopic.php?f=4...p;hilit=battery