dsmhero

I am having trouble starting my new motor(80miles on it). I can not crank the motor with the battery alone, I need to put a 100A booster on it and it cranks and cranks and cranks and after about 5-10 mins of cranking(with lots a cool downs) it will begin to sputter then finally fire up. I do believe I need a new battery but I wanted to exhaust all other options before hand. I check the leading coil connector and WITH the booster I am only seeing 10.5V and 6.5 without. Is there any reason as to why there is such a drop? The dash volt meter shows around 15.5v with the booster on. Any help would be awesome, I want to drive this thing and have it reliable.

j9fd3s

i think, that the power goes from the battery to the fuse block thru the main relay, to the coil. soOOOooo there are a couple connections on the under hood fuse block that can get cleaned up, and then you may wanna check out the main relay too

rolfs_7

first off clean all connections at the battery and check all the connections at the fuse box under the hood. after that read this and do it.

VVVV

http://www.aaroncake.net/rx-7/grounding.htm

dsmhero

How would I test the main relay?

j9fd3s

two ways, either check the voltage in and out, or click it "on" and check resistance.

dsmhero

Thank you! I am going to try the grounding writeup. Today I replaced the positive battery cable and it helped a bit but I am still having the problem. Also, I had the battery tested and it passed but the guy at the store only tested it at 200 cranking amps, so could the battery still be toast?