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Re: 85 735i starter motor "hotwire" (emergency swi (archive)
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Posted by rob (downunder) on February 02, 2001 at 19:48:08:

In Reply to: Re: 85 735i starter motor "hotwire" (emergency swi posted by Winston on February 02, 2001 at 10:31:38:

i thought there might have been a secondary use by the car computer for the ignition signal circuit (thought I read this somewhere it was used as an earth?).

some other comments re blowing fuse #21.

has anyone used it as an alternate cranker when
wanting to start the motor properly ie with the ignition on?


Rob,

Should not be a problem. I've ran a wire from solenoid (terminal 50 I believe) up towards the battery for emergency starting and to attach a switch for valve adjustments for years.

When I bought the car used it had the rubber sleeve over the solenoid. It looked like it was rubber from an old inner tube so you could easily make one.

Since I replaced the starter (worn brushes) I've never had problems and I don't have the sleeve on. This maybe due to running a 160F thermostat which keeps the engine compartment alittle cooler.

Good luck,
Winston


Given the complexity of the electrics in this vehicle, are there any side effects if I install a SPST switch between
the permanently "live" high current side of the starter motor and the signal side (at crank time) from the ignition switch? I will have the ignition switch inside the car in the "on" position but add the new wiring to do the actual engine crank. The existing wiring will be left in tact with the new one only added on to the 2 starter contacts.

The switch will be in the engine bay so the wires are not too long.

I am trying to determine if I have an ignition wiring deficiency only manifested at very high engine bay temperatures or whether the starter is playing up, yes I have replaced the starter motor, ignition switch and just
put a new battery in the car.

I have about 9 months left on the warranty to prove the starter motor is the problem.


I have no problems in cranking from a cold start or immediately after stopping, seems to be worst on very hot(35 Celsius) days after the car has stopped for about 45-60 minutes.

I do NOT have however a "sleeve" held on by a cable tie around the barrel of the soleniod housing. Not sure how
critical this is to my heat sensitive problem.

Sorry I've been so busy on the board still lots to do
on this one before I dare take it too far away from home base.

Regards,
Rob





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