124's are way not my specialty, but get them from time to time. This one doesn't fit any of the classic battery drain issues, but it's 3.6amps, enough to kill a batt overnight, at least so it can't start.

What I've tried (DC'd, checked drain):

- Antenna (NC - no change)
- RH trunk radio amp (NC)
- Trunk light switch (NC)
- Trunk light wiring (no issues/shorts - NC when DC'd)
- Pull all fuses (NC)
- Replaced OVP relay with OEM/German (NC)
- Pulled alternator conn (NC)
- Vacuum pump wires (NC)
- CCM (under rear seat, LH) (NC)
- Various engine compartment conns (NC)
- All door dome-light switches (NC)
- Glove box light (NC)

EDIT (now checked, thanks for advice, still current draw):

- GP relay DC'd
- Alarm module DC'd


Only thing that saw a slight INCREASE in draw was turning headlight switch on (to parking L,R, then full on), turning it back off didn't change the drain, but it remained high (4a)

Anyone with a 124 have more ideas on amp drains?

__________________
1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


=========================

"If you don't know where you are going, any road will get you there". Lewis Carrol

glow plug relay is unfused, and direct to the battery...

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Factory security system? Aftermarket stereo, amp, alarm or RKE?

Sixto
87 300D

Sixto, thanks, tried security system (no effect when completely DC'd), Amp, NOT aftermarket stereo. No change in draw.

__________________
1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


=========================

"If you don't know where you are going, any road will get you there". Lewis Carrol

What is the status of your battery? New or new-ish. What temp is it in CO now? Ground strap status?

__________________
2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900

Have you tried removing fuses until the draw stops? It'll help to isolate the draw to a fused circuit.

Sixto
87 300D

I did as posted above and found the dome light causing it. Replaced the dome light assembly and no more issue.

__________________
Jim

New batt (not saying much these days, but it tests out fine)

Temp is heated garage temp.

Ground strap perfect (no corrosion, 100% ground to chassis, alt charges at 13.94volts)

__________________
1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


=========================

"If you don't know where you are going, any road will get you there". Lewis Carrol

Of course. First thing I try on any vehicle. All fuses pulled. As stated in my original post. No diff in current draw. Coming from a non-fused circuit or a fuse outside of the box.

__________________
1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


=========================

"If you don't know where you are going, any road will get you there". Lewis Carrol

Could be. They are always finicky. Dome light appears to work properly with door switches, goes off as should, but the circuit in there might be drawing without lighting the bulb I suppose. Will pull it and test draw with it DC'd (did pull the bulb though, no change when I did that)

__________________
1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


=========================

"If you don't know where you are going, any road will get you there". Lewis Carrol

Did you move further aft from the fuse box and pull relays? IIRC the aux fan(s) have a fuse outside the main fuse box. For kicks you could pull the OVP relay, the other relays behind the battery and the airbag module (passenger kick panel).

Sixto
87 300D

Pulled all relays I could find. No change. Changed out the OVP with new/German. No change. For the aux fans, I'll look for their fuse, thanks. Did pull the airbag module and DC'd the alarm in the pass kick panel. No change.

__________________
1984 300D Turbo - 4-speed manual conversion, mid-level resto

1983 300D - parts car

1979 300TD Auto - Parts car.

1985 300D Auto - Wrecked/Parts.


=========================

"If you don't know where you are going, any road will get you there". Lewis Carrol

Seems to be a real spate of battery drain with W123/W124.

18 here tonite. I wont be trying to chase my issue down soon.

__________________
1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."

Alternator? Starter?

Sixto
87 300D

where did you look for the relays you could find? you need to take out the 4 phillips screws and remove the upper portion of the fuse box cover to get at the headlight and seat control relays... there is also a circuit breakout under the drivers' floor mat... up by the steering wheel maybe? Jay_Bob is the guru on 124 wiring.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!