PDA

View Full Version : K100 Igniton

My1stone
04-11-2008, 04:08 PM
I charged my battery on my 85 K100, when I went to connect the cables, Neg. first of course, I had sparking from the Pos. terminal and the engine wanted to turn over. The key was out of the switch. Any thoughts or suggestions?
BuddingGeezer
04-11-2008, 05:17 PM
Starter relay, located under the tank in the relay box has welded the contacts shut. This is due to low battery voltage. Check the search feature on this forum. there is a web site that has the Bosch relay for $30. I paid $56 at Beemer Boneyard. It is a 75 amp relay. Probably can find it through Google.

Ralph Sims
cjack
04-11-2008, 06:55 PM
I charged my battery on my 85 K100, when I went to connect the cables, Neg. first of course, I had sparking from the Pos. terminal and the engine wanted to turn over. The key was out of the switch. Any thoughts or suggestions?

I think the BMW relay welded like the post above. BUT, the negative post is the last one you should reconnect!
Think about it...if you short the wrench to the frame while connecting the pos post and the neg post is not connected...no problem. If you short the neg post after the pos post is connected...no problem.
Neg post off first and back on last.
cayuse60
04-14-2008, 10:21 AM
http://www.bmwmoa.org/forum/showthread.php?t=24379
mrich12000
04-14-2008, 11:43 AM
I charged my battery on my 85 K100, when I went to connect the cables, Neg. first of course, I had sparking from the Pos. terminal and the engine wanted to turn over. The key was out of the switch. Any thoughts or suggestions?

It's connect. pos first then neg or vias aviasa
My1stone
04-15-2008, 01:01 AM
It still wanted to spark and turn over when reconnecting the battery, this time Pos first. I banged on the started a few times then reconnected without a problem.
deilenberger
04-15-2008, 07:27 AM
You were lucky. The starter relay is nowhere near the starter - and the only way it will try to turn over when you connect it up is if the starter relay is welded shut.

For future info - the starter relay is in the E-box which is under the fuel tank. It's the big relay in the right rear corner with big red wires going to it.