I usually drive my cars until the low fuel light comes on. Bad for the fuel pump, I know, but that's how I am. Moving on.
In my 84 325e, that worked fine because once the needle hit the red part of the gauge, the light would come on. But on my 88 325is, the needle gets to the bottom white line under the red part, and the light still isn't on. I've had the cluster out a few times, and while it was out I swapped the bulb with a known good one. Didn't help.
So last night I did some searching and found out how to test the bulb. So today I pulled the rear seat and jumped the sender and sure enough, the light came on.
So when the hell does the damn thing come on? Clearly it works but I'm not going to keep driving when the needle is already at the bottom of the gauge.
Also, what sends the info to the obc? When I had the needle at the bottom of the gauge, I hit the range button on my obc and it said 37 miles left. I kept driving and after about 5 miles it actually went up to 38 miles left.
Maybe my sender is bad, actually. I jumped one of the outer terminals with the middle terminal and the gauge went to 3/4 full. Or maybe my fuel gauge. I have some extra gauges. I might try swapping them in.
Matt
In my 84 325e, that worked fine because once the needle hit the red part of the gauge, the light would come on. But on my 88 325is, the needle gets to the bottom white line under the red part, and the light still isn't on. I've had the cluster out a few times, and while it was out I swapped the bulb with a known good one. Didn't help.
So last night I did some searching and found out how to test the bulb. So today I pulled the rear seat and jumped the sender and sure enough, the light came on.

So when the hell does the damn thing come on? Clearly it works but I'm not going to keep driving when the needle is already at the bottom of the gauge.

Also, what sends the info to the obc? When I had the needle at the bottom of the gauge, I hit the range button on my obc and it said 37 miles left. I kept driving and after about 5 miles it actually went up to 38 miles left.

Maybe my sender is bad, actually. I jumped one of the outer terminals with the middle terminal and the gauge went to 3/4 full. Or maybe my fuel gauge. I have some extra gauges. I might try swapping them in.
Matt
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