Where to start troubleshooting this problem

1988 BMW 735
168,000 MILES
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MCCLOSKEY
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Car will not start when you run it for a short time turn it off for more than a few minutes and try to restart. Also will not start if you try to crank it over and don't and then try again. It will not even try to crank the engine. On long drives there is never a problem. This happens only on short trips and if you don't get the engine started the first time you try to turn the engine over. The next day you go out and it starts.

So battery is new. When I turn the key on in ignition all normal lights come on and aren't dim. Solenoid? Starter? How to test, voltmeter? Any other ideas of what it could be. I hate to replace these without knowing for sure they are the problem. I have already taken it to a repair shop last time this happened. Unfortunately by the time they are able to get around to looking at it, it is running again. So then it makes me wonder is something shorting out? They say that they can't test while it isn't happening, and I appreciate that they didn't just replace at random and charge me. It is just so frustrating. Last week it left us stranded 45 minutes from home in the middle of the night, all 5 kids in the car...
Feb 1, 2012 at 12:24 AM
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RIVERMIKERAT
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Yes. either starter, solenoid, or starter relay going bad. See image for relay location in the front fuse/relay block.
Feb 1, 2012 at 1:23 AM
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FIXITMR
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so repair shop has not tried short time period starts?
Feb 1, 2012 at 1:35 AM
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MCCLOSKEY
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Thank you for the info. The car repair shop stopped and started numerous times that day but could not get it to repeat the problem. Having no problem getting it to now. It has been dead in the water for 2 days. Replacing starter/solenoid now. I really hope it wasn't the starter relay. Now that I have bought and paid for the starter/solenoid combo... I just wanted it fixed so I went and got it. Here's to hoping it fixes the issue. Other than that the car has been a great little car mechanically.
Feb 3, 2012 at 1:16 AM
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RIVERMIKERAT
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Let us know how it goes.
Feb 3, 2012 at 1:35 AM